Questions tagged [cmos]

CMOS (stands for complementary metal-oxide-semiconductor) is a type of technology used in the manufacture of integrated circuits which include elements of digital logic.

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PC BIOS doesn't boot after failed reset to defaults

Good day. I have bought brand new PC details and did a setup. Firstly everything went fine, but I had some issues with installing W11, so I went to bios options, changed few things there, after reboot ...
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Integrated CMOS battery, how can I reset BIOS?

So to explain, I have a Lenovo Thinkpad x13 Yoga Gen 1 with integrated CMOS battery. My problem is, I don't have the BIOS password. Recently Lenovo released an update (Firmware update on windows) ...
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Why does this ThinkPad T440s intermittently refuse to power on?

I press the power button on my ~2015 ThinkPad T440s and there is no effect whatsoever. The problem occurs regardless of whether the A/C adapter is connected and whether the removable battery is ...
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Windows clock keeps falling behind, even after CMOS change

The clock on my computer keeps falling behind and the only way to correct it is by pressing 'Sync' in the Date/Time settings. I have changed the CMOS battery to a brand new one but the problem ...
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laptop not booting after CMOS replacement

I recently replaced my CMOS battery with a new one on my Dell laptop, after replacing and setting the correct date and time the system booted correctly 2-3 times but now when I boot my laptop it is ...
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Is there anyway to ignore the CMOS Check during Startup? [closed]

I have broken my CMOS battery seat while replacing the battery, and I want to my pc to Ignore Cmos check during startup. I have already turned on fast boot, but everytime I turn off the switch, fast ...
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WIndows 10 time zone keeps reverting back

I've got a user whose Windows 10 computer won't hold the correct time zone. Specifically, the time zone randomly changes back. The user is in Pacific Time, but the laptop would have been set up at a ...
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when a computer is plugged in and off,RTC still using the battery?

when a computer is plugged in to a power source and off,RTC still using the battery? or maybe the RTC "understand" that there is a better power source,the outlet? the question applies to ...
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Which BIOS/CMOS Battery for ASRock FM2A75M-DGS?

Motherboard: ASRock FM2A75M-DGS In order to change the CMOS battery of a friend's PC, can I use any CRC 2032 Li-Mn as replacement? Or do I need a special type? The manual did not say exactly which ...
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Replaced cmos battery and each time plug in socket. The time will back to 2010

I replaced the cmos battery and reset the date. (remark: save and exit bios) If I unplugged the socket and plug in again. The bios date will back to 2010 and have to reset time again. How do I make ...
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Unlock features for USB device

I have an USB camera that has a 5Mp sensor in it. But the device works only as a 1.3Mp sensor (via 2x2 binning or skipping). The 5Mp sensor is most certainly there (when plugging the device to a ...
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Error "CMOS checksum bad" after sudo apt upgrade

When I boot it up. It shows CMOS checksum bad error and goes to bios. Then I have to exit from the Bois then it will boot as normal but with high brightness. this all happens after an upgrade (Sudo ...
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Does removing CMOS battery clear CMOS?

I thought CMOS battery kept CMOS memories alive. In light of this, I find this section of my SuperMicro motherboard's manual puzzling: Why remove the battery and then short some connections? Wouldn't ...
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Can a dead CMOS/PRAM battery prevent the computer from booting up?

(Apple uses the term "PRAM" instead of "CMOS". Not sure if they are functionally the same) Can a dead CMOS/PRAM battery prevent the computer (workstation, desktop or laptop) from ...
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Reset bios password of Lenovo fails (asks for password and PIM)

I've got an used Thinkpad which asks for a password. Since the password prompt is a black screen with just the letters Password: in white I assume it's a BIOS password. To remove it I followed ...
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Can any external hardware / software write something to the cmos motherboard chip?

I know there is some software or hardware advertised to be able to read and write what is on cmos chip, but do any normal consumer pieces of hardware or software interact like this with the cmos chip? ...
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Changed UEFI from Legacy to UEFI Boot and now I can't boot Windows

I've changed UEFI from Legacy to UEFI Boot using MBR2GPT, setting the boot option to the hard drive, but after mbr2gpt finished, I received an error about an XML file, which I ignored. Upon rebooting, ...
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Desktop PC BIOS: Need to Reset everytime to boot

Having issues booting my Desktop PC (Gigabyte motherboard, i5). Everytime I try to boot, it gets stuck at the motherboard logo screen and nothing happens next. But, if I remove the CMOS battery and ...
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Surge protector behaving strangely

I just bought this surge protector which has the master/slave function, so that it disables some plugs (2 monitors and 2 speakers) when I turn off my PC. Everything is working fine except for one ...
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2 answers
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Forgot my Laptop BIOS Password

I forgot my old laptop BiOS Password, i am trying to reset it. I have already removed the hard disk and attached it with the other laptop, so its not about the data, I have already extracted all my ...
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2 answers
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reset bios password with cmospwd, ioperm startservice function call failed

I've been trying to reset the bios password on an old Acer Aspire laptop. I've been looking for a while until I stumbled upon cmospwd. I downloaded it, and it asked me to "run ioperm -i as ...
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Does resetting Pavilion dv6 to factory settings also reset any BIOS changes made in the past, setting them back to default?

I purchased a used (old) Pavilion dv6 laptop that was running Windows 10. The seller set it to revert to factory settings to remove all of his data and programs, which also changed Windows back to ...
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Removed CMOS battery and replaced, now system won't boot

Using ASUS 470, intel I5, Geforce 1060. First, I was updating the ram from the 8gb it came with to 32 from a Corsair kit I had laying around. When I attempted to change the memory speed in the bios ...
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Laptop doesn't go to sleep and doesn't respond after idle screen timeout only while connected to AC power

I'm having HP Pavilion Laptop 15-cc1xx(Win 10 Home 64 bit), and it worked completely fine until I did a BIOS update to F.34 from F.33 and then this weird issue started the laptop doesn't go to sleep, ...
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CMOS cleared after power loss, even though I've replaced the battery

One of my PCs will not retain its CMOS settings after power loss. This usually means that the CMOS battery is dead. I verified this with a multimeter on the CMOS battery after I removed it from the ...
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Power light flashing and CMOS checksum bad

After I press CPU power button the power light is flashing. After sometimes when I am pressing power button the computer is powering up and showing me CMOS checksum bad. Is it the CMOS battery problem ...
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low voltage POST only means battery problems?

No doubt the watch battery on the motherboard long since lost its juice. However, I'm not quite sure what error I saw on boot, I think it was before POST and I think it mentioned "low voltage&...
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HDD stopped showing up & can't enter BIOS

I have one 1TB HDD and one SSD on my PC. OS: Win10. About a month ago I bought another HDD, WD Purple 4TB, set everything up, formatted it, everything was okay until now. I copied photos on this new ...
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Windows won't boot after replacing CMOS battery

I recently acquired a GTX 660 ti from a friend of mine and I installed it along with a new psu on my computer today. Everything worked fine, but the graphics card wasn't detected by anything, wouldn't ...
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With a Gigabyte motherboard where I have flashed the BIOS, if I reset the CMOS will it also reset the BIOS to default?

I have a GIGABYTE GA-Z77X-DH3 motherboard. In March 2020 I flashed the BIOS in order to make it compatible with a Windforce graphics card. This caused Windows 7 to think my computer was new and it ...
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How to reset a laptop BIOS with no CMOS battery?

I have an Asus X455LD and I tried to update its BIOS and it went wrong. The laptop turned off when the process finished, and now when I press power button it does not turn on. The power led turns on, ...
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Can laptops run without a Cmos Battery

So while I start the process of getting a new cmos battery. Will my laptop run without one if I remove the old one? Since a lot of you said it might leak can I remove it and still run?
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How do I make my own laptop Cmos battery

The people on your site helped me find a Cmos battery for my laptop. https://www.ebay.com/itm/NEW-OEM-FOR-HP-Pavilion-dm3-dm3-1100-Series-Battery-Cmos-Resume-RTC-/264449233544 But I realized this ...
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Changing CMOS battery for Hp Pavillon dm3t-1100 laptop

So started seeing that my computer clock date and time are ahead or behind. This computer is old so I think it's the battery. Had a few questions If I don't change the battery will computer keep ...
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How to boot Gigabyte GA-Z97X-UD3H motherboard with a 4 TB initialized WD HC310 HDD?

I have a Gigabyte GA-Z97X-UD3H motherboard and I purchased a WD HC310 (0B35948 HUS726T4TALN6L4) HDD. After I initialize the new HDD the PC cannot pass the POST (just freezes). If we detach the new HDD,...
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Where is the jumper to reset BIOS on Toshiba Satellite e45w-c4200x

i am from Indonesia, please helpme... show to me where key position to reset bios password... on thosiba satellite e45w-c4200x
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Laptop keeps restarting

I switched the internal graphics device to disabled or enabled, I cant remember which one, but then laptop just keeps restarting and seems to be dead! I cleared the CMOS and started again but it made ...
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2 answers
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How to firmly place CMOS battery on Asus X200MA Laptop motherboard?

I have this old Asus X200MA laptop motherboard and while changing the CR2032 CMOS battery I found out that the old battery popped out fine, but the new battery does not fit in tightly in the same spot....
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Toshiba Laptop Not Retaining BIOS

We have a Toshiba Satellite L50-C-1FR laptop. For some reason, one day it stopped retaining all the BIOS information (time, date, etc). The info has to be set every time it's booted. The first thing ...
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Need to clear CMOS to then be sent recover BIOS setting, to then be allowed to boot

As the title says every time I shut down the computer I need to clear the CMOS with a built in button on the RAMPAGE V EXTREME. I then get sent to a page which tells me to enter setup to recover BIOS ...
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how to set bios to default

my laptop is locked up by a BIOS password I mistyped. Now I can´t access windows. All I get is a password prompt. I removed the CMOS battery for over an hour but nothing changed. Tried looking for a ...
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why the BIOS settings did not save on my pc? when I unplug the charger the parameters are lost

Asus x553ma Windows 8.1 64 bit I don't have battery and asus x553ma do not have CMOS location on motherboard
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Unable to remove boot options on Asus motherboard

I have an Asus H81M-K motherboard that boots into its UEFI BIOS Utility. It seems that my old boot options are still showing up in the utility even though I have tried the following: Removing all ...
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How to write CMOS time?

I have a fairly new computer (i.e. not likely BIOS battery problem), and every time I boot/reboot the time is off by ~2 seconds. To fix this, I every time have to set my time manually, and then run ...
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HP Pavilion 15-E037cl boot failure after shutdown or hibernation

When I shut down or hibernate my HP Pavilion 15-E037cl hardware manual system, it fails to boot. The power comes on, the wireless light turns on but the screen remains blank. Caps lock blinks ...
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PC double boots before POST, then boots normally

When turned on from any power state (S1-S5), including sleep modes, my PC turns on, then off, then back on and boots as if from shutdown, thus losing work and closing programs. The shutdown occurs ...
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Where is the jumper Point to short to bios CMOS on my Toshiba satellite U-505 s2005 laptop

Where can I find the CMOS jumper points on my Toshiba satellite U-505 s2005 laptop?
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Repeated hardware failures

I got the following situation: In less than 2 weeks, three PCs of mine failed, 2 of which are industrial-grade workstations. All of them failed while awakening from standby (not hibernation), one ...
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The only BIOS boot option is floppy disk drive

I believe that my problem was caused by faulty CMOS battery that I didn't change for 5 months. Every time I booted my laptop I was ask to set time/date. After extensive reading (I'm not an expert, ...
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Asus N56VZ won't boot after enabling xhci usb pre boot option in bios

To continue from the title, the display doesn't turn on after enabling the usb pre boot option. I have tried taking the laptop apart, removing and replacing the cmos battery with no success. I have ...
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