How To CORRECTLY Clear Your CMOS
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I've seen weird and misleading comments before... but this one was so outlandish! Clearing your CMOS is super simple and doesn't take a rocket scientist to figure out. We'll prove it in this video! Here's how to clear your CMOS - multiple ways!
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You the man for making a video out of this specific issue. I actually learned to clear CMOS with a screwdriver watching one of your videos. For many many years I use the little jumper thing that comes on old mobos and optical drives to clear the CMOS. Your method is so much easier and works as intended.
It has a little risk on it, if your hands are shaky you could short something else and this could be a big problem if you do not power down and unplug your system AS YOU SHOULD!
Also dropping the screwdriver or holding it wrong, applying too much pressure and bending something is possible but this has a very low chance to become a problem even if you do this 1000 times.
Finally, yes I also reset with a screwdriver.
ha ya same. I mean the jumper method works, but certainly haven't seen a jumper in maybe 20 years either, where i have an endless supply of screwdrivers. I also don't miss setting slave/master on drives and disks.
if you remove the battery for about 10 minutes the bios will be cleared, works the same as jumping pins
If you get really frustrated or doubt that the CMOS is actually clearing you can remove the CMOS battery from its housing. That's how we did it back in the olden times.
Removing the batt is a trick from 1999....
In my experience, usually jumping the pins or removing the battery for a second or two does the trick, but it's a good idea to wait the little bit of extra time just to be safe. Not like you can over-reset it, after all.
On my pc the cmos is reset already when I turn off the psu and hold the power for like 10 seconds
I'f I'm resetting the CMOS I'm already saying a little prayer so no need to rush.😰
@@richardbottom9843 Replace the battery, like any battery they still need to be replaced eventually.
You missed a fourth option: You can easily clear your CMOS by dunking your fully powered on PC in the bathtub.
It didn’t work
@@ashwaw7410 Shocking.
The commenter was talkin about Gigabyte boards. My Gigabyte Aorus B560i Pro AX manual is saying that always turn off your computer and unplug power cord from the power outlet before clearing the CMOS. And this is how it has been since my first clear CMOS in like 1998. 🤣
Actually, the CMOS nowadays consists of a NVRAM chip (non-volatile) but motherboard manufacturers kept the shortcut of clearing the cmos by taking out the battery bcz people were/are used to this. But, yes, in the past the chips actually were volatile chips
It's my understanding that modern boards still contain a small amount of RAM in the RTC which _is_ volatile. That part hasn't changed. Vendors just default the "removing the battery" step to clearing whatever's also stored on flash because there'd really be no other reason to remove it apart from preventative maintenance.
NVRAM is available only on server based mobos not daily use mobos
@@dr.stephenstange4979 that is Not correct. In fact you can see The NVRAM on nearly every UEFI Mainboard. Also in The past, the BIOS was saved on ROM, which was non volatile. If The BIOS was saved in volatile way, The BIOS would bei gone, If Battery was empty/mailfunctioning once. That would bei pretty dumb. Raspberry Pis dont have one. The MB Producer Compaq even Had Mainboards without CMOS Chip.
@@flipsundsalti1949 okay that was new i didn't knew about it. Thanks for expanding my knowledge buddy ☺️
@@GregSalazar I had a lenovo laptop and thats how I learned the hard way bios use NVRAM on UEFI implementations.
TLDR I bios modded it to unlock wifi limits (and I got unlocked bios options as well). I changed one settings too many and the system stopped booting!
and I had no way to load defaults. removing power + cmos cell, did nothing.
settings are written to the same chip UEFI is on, so by reflashing the modded bios, I got back my vanilla settings.
I would assume the same goes for desktops.
shorting the pins or removing the battery runs a small line of code that erases the NVRAM.
which would be why you would assume you need power to be ON (standby).
maybe not every manufacturer checks the RTC (volatile), and if emtpy, reset bios settings..., and in that case. no power, reseat battery = no clearing of bios.
Pretty sure that user will be deleting their TH-cam account after they watch this. Greg always responds with class. One of my favorite channels to follow.
Why?
Obviously mobo manufacturers want you to short out pins on your board while power is on that way when you short the wrong pins you get to buy a whole new mobo!!
LOL
It is clearly seen that every time you have screwed, you haven't screwed with confidence. In 70% of your videos, you aren't screwing anything at all, as there must be power in the system for the screwing to take place. Without power, when if you attempt to screw, it will screw without confidence. In fact 90% of the screws in your video, are without confidence.
_mind blown_
😂😂😂
Screw in with confidence. I rike his style.
That's why I enjoy your content. Your honesty to help others and for free. Keep up the awesome work Mr. Salazar, all of us learn new things on your content. Thank you and everyone that helps you create your show!
Just to be clear: What's happening when you do this is that the UEFI firmware on the board runs specific code to clear out the UEFI variable store. The variable store is _not_ battery backed, but rather in NOR flash. Exactly how this can be triggered, and also what gets erased, varies between motherboards - some will fully reinitialize the variable store, others just flag all or some UEFI variables as no longer valid. (Think of the variable store as a small file system inside your BIOS chip.)
Because so many people are familiar with "clearing CMOS" by removing the battery, from back in the days when CMOS was actually a thing, most motherboards (but not all - gamer/enthusiast boards usually will, but OEM and professional boards often not) will trigger an NVRAM reset if an invalid RTC date is detected. This, however, is emulated behavior, and can be quite inconsistent between boards.
Also, motherboard makers really need to start labeling that jumper or button "clear NVRAM" or "reset BIOS settings", depending on what it actually does; calling it "CMOS clear" is ambiguous due to the complexity of the UEFI variable store (e.g. it may or may not fix a boot failure caused by a malformed variable entry, as opposed to just bad overclock settings, depending on how "CMOS clear" was implemented).
been building pc's and repairing clients pc's for 20+ years now, i just remove the cmos battery to clear the bios...nothing wrong on how Mr. Salazar fix computers..., watched all of his fix or flop videos...i enjoyed everything and learned a lot from him...😀
UGH. This is one of the reasons why I cannot be a TH-camr. You have way more patience than me, Greg. I have reset the CMOS hundreds of times over the years, and i always use the "remove CMOS battery" method, and barring some isolated incidents, it works. So i cannot even begin to fathom what that guy was talking about. Thank you Greg and sorry you had to deal with that. Upside, you got some useful content from it lol.
Thanks for watching! Just comes with the territory hahah!
Also worth pointing out that if you do turn your PC on and its clock is wrong chances are that CMOS battery is dead and needs replacing they don't last for ever.
You forgot to add...after it's been unplugged or through a power outage.
A normal shutdown will hold the C-MOS settings, date,, & time even with a bad C-MOS battery by getting supplemental power from the outlet.
I've actually gotten a few dead(does not power on at all) PC's to boot again just by replacing a dead cmos battery.
This is the gigabyte instruction You may clear CMOS to revoke previous BIOS password. Please turn off power and remove power cord from motherboard before clear CMOS. To clear CMOS, you may follow the instruction below:
If there is a [CMOS_SW] button on motherboard, just press this button to clear CMOS.
If there is a CLR_CMOS (Clearing CMOS Jumper) jumper on the motherboard, you may place a jumper cap to temporarily short the two pins or use a metal object like a screwdriver to touch the two pins for a few seconds. (You may refer to the manual about where CLR_CMOS located.)
If there is no CLR_CMOS jumpers or [CMOS_SW] button on the motherboard, please follow the steps to clear CMOS:
Take out the battery gently and put it aside for about 10 minutes or longer. (Or you can use a metal object to connect the two pins in the battery holder to make them short-circuited.)
Re-insert the battery to the battery holder.
Connect power cord to MB again and turn on power.
After clear CMOS, please press DEL to enter BIOS and select [Load fail-Safe Defaults] or [Load Optimized Defaults] then save changes and reboot the system.
this whole video, had me thinking of the Staples "Easy" button... love it.
Great video! I think we should all thank Lavir for their comment coz I'm not sure we would get a video on CMOS clearing otherwise. I think it looked like something so simple for Greg that making this prob wouldn't cross his mind. I for one am happy to realize I didn't get things wrong with my self-taught understanding of CMOS, and it was nice hearing about volatile memory froma professional :)
Those who know, *do* .
Those who don't know, try to *teach* .
Lavir heart was in the right place. Its just his brain wasn't.
Said that I did.
I’m the filthy casual that removes the CMOS battery because sometimes I’m too lazy to search up where the clear cmos header is. Hopefully that commenter is at least willing to admit they’re wrong after watching this video
Love the video. It was straight and to the point. No three hour video with excessive talking about everything not related to the topic at hand. Great job Greg. Keep 'em coming. You've got my vote.
if you remove the battery, and the power is disconected, you can hold down the power button for 10-20 seconds to drain any residual power from the system instead of waiting 5-10minutes, this is the trick I use, works every time.
Many years ago I upgraded the ram in my PC I had at the time, and I was just learning about the workings of PCs (I had an old Dell before that that I had fitted an old school slave/master HDD configuration, and that was it).
Just like with the Dell, when I fitted this ram I looked it up on the internet first to make sure I was doing things properly, and did exactly the same when I fitted my first graphics card as well.
One of the things that was mentioned was if your PC does not post after fitting the ram, reset the CMOS and the only way they told you how to do it was the final option in this video, remove the battery for about 10 mins. Since then this is how I have done it. I have only had to do it one other time, and that is on my current PC when guess what, I upgraded the ram.
I actually forgot about resetting the CMOS and started panicking, pulling the ram out, reseating my original ram etc. Once I calmed down I did a quick google search on my phone and the first thing that popped up was CMOS .. it all came flooding back and worked perfectly.
I never knew there was a reset button on some boards or about the jumper pins until I started watching your videos.
The fact the whole point of the CMOS is to make sure your bios is saved and stuff like the clock is still running, should tell anyone that the CMOS battery is what is supplying the power to it, and that it does not need external power to run.
If the CMOS needed power to work, then every PC anyone buys or motherboard would not work properly when you buy them, because they have not had power going through them for some time potentially.
steps starting from 4:35 thanks me later. sorry, greg for skipping.
Cmos placement on that board is amazing :D
I'm trying to figure out how the commenter got it so wrong, and the best explanation I can come up with is that they thought that jumping the pins is sending power to the BIOS chip to somehow do the erasing. But even if that was true then you could still theoretically clear the CMOS using the "power" from the CMOS battery, because it's a battery and it has power.
What does he think the battery is for then? 🤣
But fair play to Greg for handling this in such a polite manner.
Clearing cmos is cutting power from the battery like you say.. it's also why removing he battery also clears cmos.... I don't know why that person so so confident and decided on calling you out when even plenty of manuals tell you to have the system off.
Already know how to clear the CMOS but I found it funny that you made a dedicated video as a response to a very confident incorrect comment.
Also that CMOS battery placement on that board is very convenient, typically see them myself nearby the bottom right and in some boards gets covered by the GPU.
I'm more surprised to see a CMOS battery mounted on its side!
From a Gigabyte manual:
"Use this jumper to clear the BIOS configuration and reset the CMOS values to factory defaults. To clear
the CMOS values, use a metal object like a screwdriver to touch the two pins for a few seconds.
Always turn off your computer and unplug the power cord from the power outlet before clearing
the CMOS values."
You might need to send a charge through the chip to jump it into action , Sorry wrong
I have a 9th gen MSI mobo and the 3x that i cleared CMOS is EXACTLY as Greg shows in this video.
The MSI mobo manual also says to first pull the plug out of the wall socket then press the Power on button for 5 seconds before shorting the clear cmos pins.
Probably it's the confusion between "reset BIOS settings" and "Flashing/updating BIOS".
BIOS (motherboard firmware) is stored in CMOS (the physical chip). In my understanding, it is NVM. It retain it's data even without battery.
BIOS settings, on the other hand, needs battery. If it's removed, the settings will be cleared. So the settings must be stored in volatile memory.
Flashing BIOS then, of course, needs electricity, so you need the motherboard to be connected to the wall.
Reset BIOS have to be done when the power is cut off.
Correct me if I'm wrong.
The BIOS chip stores the firmware and the BIOS settings in CMOS to be correct.
Poor lad didn't understand the concept of a battery lmao
i thought it just keeps time now, settings are kept in a small storage chip and the manufacturers kept the tradition of removing the CMOS to reset them
Very informative video, but I will say, you both have a good point. I typically reset the bios with the computer on and have had better results than pulling the battery or using the jumper alone. Either one will work, but if you have a motherboard that is so stubborn and will not boot or post, I HIGHLY suggest powering it up and jumping it 3-4 times till it posts. Once it posts install a new bios and be done with it.
Love the channel Greg! Thank you for all your great content
Just a small addition. I just the other day had to clear cmos on an ASUS X570 board. None of the usual methods worked so I went to the manual. It stated to not only remove the battery but to also short across the battery contacts. My guess is they must have a really good cap on that circuit because that is the only thing that eventually worked. Shorting the pins and removing the battery for over 10 minutes did nothing. I'm sure leaving the battery out even longer would work but I'm not that patient.
The only flaw in this video guide (which is 100% correct) is that if you've had a problem with the CMOS and this has caused your BIOS settings to randomly change, then check the voltage of the battery (CR2032 normally), this should be in most cases *** OVER 3 VOLTS DC *** when removed from the circuit, anything less than that and it should be replaced.
At rest they will normally read 3.2V, but as is good practice in the trade, when a PC comes in with suspected CMOS issues or if stripping out to clean down or repair a system, record all the BIOS settings and just replace the battery with NEW, in date (shelf life matters here) one. They are so cheap ($1 for a 6 pack) and easy to replace in most cases, that missing this step can lead you on the wrong path when diagnosing systems, and yes I have seen some of Gregs videos where I am screaming at him to replace the battery, he doesn't and he condemns a board which was older and probably just had a battery on the limit where it couldn't power the CMOS to hold its settings during the training cycle and it would leave the systems in boot loop.
Mmm interesting point, I have had cmos batteries be the issue once or twice so would think along your lines of reasoning.. but it is certainly a component most will over look.
The guys comment literally goes against the whole point of CMOS battery. How wierd. Its so annoying when someone is trying to make a point about something and so clearly doesnt have clue what theyre talking about.
Full send on this disinformation Greg. 🔥
You can do all those steps to be absolutely sure the CMOS is cleared, but I personally had a 100% success rate just touching the clear CMOS pins or pushing the button for a split second, at the rate I have to clear the CMOS on some days, If I did all those steps I'd never get anything done. No disconnecting power, no discharging caps, no removing battery. Maybe my method won't work on some boards, but on all my boards for the past 20 years it worked just like that. I never owned Gigglebyte boards though, so maybe I just got lucky.
Most boards these days gave at least a few LED's so they drain the latent power on their own, they go out in a second or 2 indicating the board is drained but if you have an older board holding the power is a quick step.
@Greg Salazar , you did good there! The person making that comment must've been sleep deprived or was smoking something at the end of a tail pipe without a catalytic converter. We all need to learn from our mistakes. Hopefully that guy who clears his CMOS while the system is powered(and perhaps running as well) learns a thing or two.
Thanks for doing this video.
u are so right greg using cmos battery to clear cmos
So... is it 70%, 90%, 100%? Seems they're very confused about how often their misconception is the case. Their confusion could have been solved with a quick Google to find that EVERY single guide to clear CMOS includes removing power from the system. I love how they were so confident that typed up that essay.
And if your having weird issues with your computer booting, you could always try replacing the CMOS battery with a new one (most commonly a CR2032). Believe it or not, I have had to replace the battery in my X470 motherboard, which is not very old!
Yep, changed cmos battery on a laptop that wouldnt boot. Instant boot. Those batteries can last years.. but not all are infallible. Lol
My Thinkpad has been running with a dead CMOS battery for years, just reset the time and date before booting it up and it's good to go. Do you have to memorize all the settings in the Bios before you remove the battery, what if you forget an item?
@@wilsont1010 Unless you've done some customization, usually just activating the "load defaults" will do fine. Just don't forget to put your memory profile back on if you had one selected, since it tends to reset those to "none/disabled."
Easiest way to clear a CMOS...Just take out the battery and count 10 seconds then put it back in...DONE
broooooo you're my hero man I followed you step by step and it work
I would always recommend referring to the motherboard manufacturer's manual to confirm the correct method of clearing the CMOS. My Gigabyte manual is very clear that to clear the CMOS using the back panel button or the jumper on the motherboard, it tells me to turn off the computer and disconnect the power supply from the wall before carrying out the clear CMOS function. In fact, the manual warns against clearing the CMOS with power on. You can't go wrong checking the manual before carrying out the maintenance, because if the manual is wrong you have covered your butt for follow up action with the manufacturer in case something goes sideways.
I bet Lavir rolling on the floor embarrassed rn 😭
Sometimes when I remove the cmos battery for only a short amount of time, the settings do not get cleared completely and I end up with weird issues. Then I have to remove the battery a 2nd time, turn off and unplug the psu, drain the power from the board and wait a full 5 minutes before putting the battery back in. Then it works perfectly.
1 minute in, yeah, after 18 years in IT AND being A+ Certified, OP is full of it. As a gigabyte motherboard owner, he is 90% WRONG (ASK ME HOW I KNOW LAVIR). Thanks for calling them out Greg.
Yep, I also am A+ certified, and I remember a question on the exam about clearing the CMOS. Greg is spot on regarding the correct methods.
Now, I could be wrong, but afaik modern systems do use non-volatile memory chips to hold the UEFI. So while you can remove any power source and any changes you did to the UEFI will "stick", manufactuers decided to use that "i removed the cmos battery" to force a bios reset anyway.
(or what that other post said)
My Gigabyte motherboard (X570) came with an empty CMOS-battery. I can confirm that the CMOS gets cleared every time without a battery so yes, cutting the power will clear it, or not having power in my case. It really sucks that a company like Gigabyte ships these motherboards with empty batteries. In my case the shop sent a new one. (Yes, I verified the orientation of the battery and I even tried out the battery inserted reversed to make certain)
That "Lavir" guy was so busy criticizing about electricity , he forgot what the CMOS battery is for 🤣
thank you so much for this video! the screwdriver trick got my pc back up and running!
Lol, that's why people should READ proper information and research (properly) before posting their ignorance. Glad you cleared it up!
I always owned Asus boards for the past 33 years I have an Msi beacuse it was only the one in stock :), and ad per Asus instruction, was to shutoff system ,remove battery and clear cmos jumper for 10 seconds .
Greg you should just point him out on any motherboard manual. Yesterday i was building new system using old motherboard with different CPU and RAM. To avoid any trouble i wanted to clear CMOS. I checked the manual to find where exactly these two pins were and voila, here was a guide how to clear CMOS. Step 1. Turn off your PC and unplug power cable. Besides that there are also 2 other aspects that are against doing that when the system is on. First, I think it would be really bad idea poking with metal screwdriver into motherboard with running system. One slip and you end up with short. Second, CMOS powering must be obviously totally independent from main power, else how it would work?
Clearing the CMOS saved my arse at least once.
Jumpers do exist!!!! lol My wayback pc building remembers having to set a Jumper for FSB.
remove battery its good, press power boton also ok, dont remove jumper and only place a screw driver wrong, its more efective remove the jumper and power on the mother board also erase the bios info
LMAO I love how he is confident while being wrong.
Thanks for clarifiying.
G'day Greg,
I guess the person who wrote that comment DIDN'T get their information from Intel as their "Product Support" page regarding "How to Clear CMOS to Reset BIOS Settings in Systems with Intel® Desktop Boxed Processors" says... (Special note of Step 1)
"Steps to clear CMOS using the jumper method
1. Power off the system.
2. Open up the system so you can see the motherboard.
3. Locate the CMOS jumper by referring to the motherboard manual and how to clear the CMOS. In general, the CMOS jumper is three pins located near the battery.
In general, CMOS jumper has positions 1-2 and 2-3. Move the jumper from the default position 1-2 to position 2-3 to clear CMOS. Wait 1-5 minutes then move it back to the default position.
Power on the system. In some systems, you might need to enter BIOS to reset to the factory defaults."
The mental gymnastics it took to write that paragraph should be applauded.
I've pulled the CMOS battery out of board when they're out of the system... bare board w/ CPU installed. Once I connect everything together and boot, I'll get the CMOS clear warning.... hit F1 to recover settings screen.
The +5VSB supplies power to the system when not in use.... and I believe it also supplies power to the CMOS in addition to the coin battery. So if the battery is pulled and the power isn't cut to the PSU then nothing will happen.
I have never tried it the way he wrote it. Now I wonder, what happens if you leave the PC plugged in (but turned off) and hit the button/jump/remove the battery?
I have a Gigabyte motherbord and i had to clear the CMOS recently.
I removed the battery and powered down the PSU for about 20 seconds and the CMOS was cleared.
I believe there was no need to power down the PSU on the switch but i wanted to guarantee there was no remaining energy on the capacitors that could possibly "feed" energy to the CMOS.
So the statement that all gigabyte MB should be on to clear CMOS is false.
Also, the purpose of the battery is to maintain the BIOS powered so it maintain its memory at all times, even when the PC is disconected from the wall.
If the BIOS loses power it will loose its configuration so i think theres no need to explain more why that statement is wrong.
I had to clear the CMOS, I tried to short out the pins with the power off, but that didn't work for some reason, maybe the power needed to be on, but I wasn't going to short out pins with the power on. I had to remove the battery, that worked fine as you would expect.
People have been clearing CMOS for decades by powering off the system. I don't get where the reddit POST is coming from.
ice its actually working, im suprised
Hey just so you know that site you promoted is known to be a scam and is not trusted by many, I think you should clarify that in the comments or description.
You face at 5:18 is freaking gold lmfao
You can also reset the CMOS by cutting all power. No batteri or cables
5:48 two-pin jumpers are also like a penny+shipping for 100, so don't even need to use a screwdriver
Yeah there's a lot of misinformation going around right now because people are not being questioned or called out on the things they are saying that is wrong. Having an educated opinion is a powerful opinion.
"because people are not being questioned or called out on the things they are saying that is wrong" - that is just so true - people now think all that is needed is the ability to describe "my truth" or "my lived experience" and suddenly they are an unimpeachable expert. Crazy.
It always amazes me to see people so confident in what they have Zero idea they're talking about!!! Rotfl!!!! Great vid Greg!!!!!
The story isn't the CMOS, the story is the need for "tech" people to be right. The guy who called out Greg as being incorrect, when in reality was the one incorrect, is part of a larger problem in tech today. We are so desperate to prove ourselves and get approval/validation from others. I left IT 20 years ago for this reason, and I have never been happier.
I learned a long time ago that even when you think you're right it's better to make your statement in the form of a question so you look better but still create a conversation. So in this case maybe the OP could have said "I thought you needed the MB powered on to clear the CMOS, am I wrong?" I also used this technique at work when management would have a quick stand up meeting with some policy change and as the trainer I completely understood the change but they'd often just blurt out the change without much explanation and I'd see the glazed look on our employees eyes so I would reiterate in a more intelligible way the new policy and add "is that correct?" to force them to confirm. They always looked at me funny when I did this because they knew I knew what was going on.
Could this be the start of a new series, "Learning with Greg"?
Nice, I always drained the capacitors after removing the battery, but don't think it makes any difference I suppose as long as the PSU isn't getting plugged or if it's turned off completely.
I like to use something to jump the connectors of the battery holder on the motherboard to be even more sure that the cmos is resetting.
Always nice to see an x58 board
Always have just popped it out for like 5- 10 seconds instead of minutes and it always works regardless of it being plugged in or not.
Wow that man was EXTREMELY confident in his incorrectness lol
Weird how his comment ends with saying that it works, while insisting that it doesn't work....
idk if anyone will see this but i need some computer help im struggling with i will launch windows and play some games for a while but after a long period of time i will be sitting at the windows home screen or watching hulu and my monitors will lose signal and my computer bricks up, the only way to shut it down is hold the power button down for 6 plus seconds.
if anyone can help that would be appreciated
Meanwhile, as I'm too lazy to find the pins, I just extract the CR 2032 from its socket 😂😂
Lavir if you are watching, ointment with aloe vera is good for all of the burns you are experiencing right now.
Can you change the CMOS battery while powered on to prevent loss of BIOS settings? Thanks.
lol the idea of clearing the cmos battery IS to clear the bios settings..
Well at least in the last century people were reading the manuals of their boards. In my case you will find something like this: "To clear and reset the system parameters to default setup, please
turn off the computer and unplug the power cord, then use a jumper cap to short the pins on CLRCMOS1 for 3 seconds. Please remember to remove the jumper cap after clearing the CMOS. .."
That confident BS commenter could be right if there is an EEPROM used to store the volatile Data, so READ THE MOBO MANUALS and all of a sudden you know what to do, it is pure MAGIC.
Thank you, this help fixed my Bluetooth Driver problem!! ❤️❤️❤️
The comment you refer to is quite comical to me as every Gigabyte board I've used has stated that you need to remove power from the PC and either jump the CLR_CMOS pins or remove the battery. Even my Asus Prime X570-Pro lists the first step in section 1.1.7 pg 1-9 as "Turn OFF the computer and unplug the power cord." I've used both jumpers from old HDD's to clear the CMOS and a flat head screwdriver, anything metal that can make contact with the 2 pins will do the trick, just have to be careful is all.
With some older boards, reseting bios via jumper when system is powered on.. Could f... Your bios (will reset every time system is powered off).
With some boards, they refuse to post when cmos battery is emty (or to low voltage so with not posting boards, one of first things i do is chek cmos bat).
Also with some boards, when OC fails and You get no post... They need very long bios reset (have few DFI lanparty boards that do this). Havent seen this bug in newer boards thou.
Seen all kinda wierd stuff with bios/cmos..
Worked with pc-s since 90-s. Not once i seen board that needs to be powered on to reset cmos, lol
Also if You use remove battery to reset cmos, short 2 conectors on battery socket. This way You need 20 sec instead of 10min (its much same as shorting jumpers but somehow with some boards works much faster ;)
It hurts my head you were put in the position to make this video but I love you for it
Greg is right. But remember batteries can fail. You can measure the V, but that does not mean the battery is good under load.
I'll start out by saying that I always start out by holding the power button down like you said after the power cord is removed or the power supply switch is turned off, like you said. However; I have had weird situations twice in my life where one time on a really old 1990's motherboard I had to take the battery out for a week for the board to work again (probably something besides the cmos going on there), and most recently on an X570 board I had to take the battery out for an hour for the board to work again and I'm still using that board right now with no other issues ever. Consider that I've reset cmos thousands of times while working at a refurb shop and on my own stuff and these are the only 2 times this has happened.
Ppl saying its a non volatile ram
If I don't have a screwdriver handy, could I use a metal spoon? lol
that's what I thought. I am 33 years old and when I was 15 I learned to do each of the "RESET BIOS" processes, that's what I and my friends used to call it and still call it today, for safety I would hold the power button down for 30 seconds with the Power Source button off and during that time because I only had one Jumper. We would swap the other two pins or remove the battery and hold the power button down for 30 seconds like that because the Clear CMOS button was only for the rich :D . I didn't have that option back then. But at the end everything was back to the Original as it was at the beginning.🤘
Clearing the CMOS does work 💀, when I overclock my ram my system just won't start but after resetting CMOS I am able to on my pc
Imagine jamming a screwdriver into a powered motherboard and it touches anything but the CMOS jumper.
using a HDD is not a good example of the point you where trying to get across with volatile memory as a HDD stores data magnetically which is a completely different process of storing data to compare to nanflash, yes it is non-volatile memory but a different forum and process.
for Cmos chips they are comprised of both nanflash and volatile memory it's basically two chips in one.
Cmos bios chips now and days are a combined chip of nanflash witch you flash your bios to witch is non-volatile memory and your settings are saved on a volatile memory chip within the Cmos.
this is why your bios is always saved wen power is removed and why your settings get whiped wen you lose power to the volatile memory chip wen the battery is removed.
I aways just take a cmos battery and pres couple times power button
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