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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Why the TPM PCRs does not consider a UEFI settings change? If someone resets CMOS, it's undetected

In my laptop I've set up a bios pw when I power on the laptop, and once I enter it the laptop starts my linux distro and decrypts the disk without asking any other password. To do this I've set up TPM ...
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8 answers
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Checking CMOS battery without going into the BIOS

Today, I found my Windows 10 date and time too far ahead by about 26.5 hours. The time zone is fine, and I corrected the problem by clicking on a "Sync" button to sync with a Microsoft ...
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I Forgot CMOS administrator password

Hi I forgot my admin password for a probook 450 g1 . I have removed the hard drive and CMOS battery and still asking for a administrator password
Garrick Plouffe's user avatar
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How does CMOS battery affect hardware?

I have seen multiple websites that claim a dead CMOS battery can cause hardware failures due to driver issues. (electronicshub dot org/symptom-of-a-cmos-battery-failure/) How is this possible if the ...
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1 answer
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Toshiba Satellite L300D, remove BIOS password

I have this Toshiba Satellite L300D laptop with unknown BIOS password. As I turn laptop on, message appears "enter current password". When I get it wrong three times, laptop turns off. I ...
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How can I save the BIOS CMOS or the UEFI BIOS settings of a notebook in a file and restore them if necessary? [closed]

Basic configuration settings of a PC are stored in the BIOS CMOS or in the UEFI BIOS. In DOS times there was a software called Checkit and QAPLUS, at least one of them could save the configuration of ...
Alfred.37's user avatar
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Gigabyte GA-H61M-S1 motherboard infinite boot

I have 3 computers with the Gigabyte GA-H61M-S1 rev 2.1 motherboard. I was using one of them but after restarting it, it got into an infinite boot with no display (integrated GPU there is no internal ...
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SuperMicro X9 and X10

I'm trying to understand fully that only when the CMOS battery is removed and the JBT1 Pads are shorted, the CMOS memory is clear. Is that correct? Also, shorting the jumper pads while having the CMOS ...
Tomas O's user avatar
2 votes
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There are two PSW switches on this motherboard. What are they for?

Im checking out the motherboard on an Asus Vivo AiO (all-in-one) computer. The computer model is: m241. The motherboard model is: V241DA. Originally, I'm having an issue viewing BIOS, POST, Advanced ...
Neightown448's user avatar
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How to fix broken CMOS after pc battery replace

I recently changed my PC's battery (not the CMOS' battery, the PC's main battery). After that, whenever I boot my PC I get the "Invalid CMOS checksum" error. Therefore, the BIOS settings ...
Juan Esteban Arboleda Restrepo's user avatar
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Desktop PC restarts continuously after shutdown

My win10 desktop pc runs fine, when I can get to the OS. When I shut down the pc, it immediately restarts, and I'm assuming fails POST, because the nothing appears on screen. Then it shuts off and ...
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Laptop won't boot after BIOS settings change

The laptop is an Asus X55C from 2013 running a dual boot Win/Mint on a SATA SSD. Lately I noticed multiple Ubuntu entries in the BIOS boot menu (even when my SSD was removed from the laptop) and ...
golfsimon's user avatar
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BIOS has a password which I never set (Rootkit?)

Background info: our network was infected years ago by a hacker (loser stalker). I suspect he was using Remote Desktop, as the icon appeared when I unhid Windows items, like it had been used. I re-...
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PC Refuses to boot up with 2nd internal hard drive

I have a 120GB SSD for my OS and a 1TB 3.5" HDD for extra space. One day, I woke up and started my computer. After I booted it up, it was extremely slow. I tried restarting and it did restart but ...
Jardani Jovanovich's user avatar
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No Power to Asrock X570 Phantom Gaming-ITX/TB3

I have an Asrock X570 Phantom Gaming-ITX/TB3 The recent problem was that my computer would regularly have lost the TPM settings from the BIOS. The computer would also start up on its own with no ...
Ben Swinburne's user avatar
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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 ...
Evgenii Rezuev's user avatar
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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) ...
shakesbeer's user avatar
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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 ...
fishyfriend's user avatar
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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 ...
Oast's user avatar
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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 ...
RAHUL JAISWAL's user avatar
3 votes
2 answers
16k views

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 ...
dEhiN's user avatar
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0 votes
3 answers
658 views

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 ...
postFix's user avatar
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1 answer
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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 ...
e12345678's user avatar
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0 answers
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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 ...
J. Ramos's user avatar
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1 answer
53 views

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 ...
Jasil Ek's user avatar
2 votes
1 answer
600 views

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 ...
MWB's user avatar
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2 answers
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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 ...
kramer65's user avatar
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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? ...
J44521's user avatar
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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, ...
lidistat67's user avatar
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1 answer
969 views

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 ...
Nikhil Shah's user avatar
1 vote
1 answer
42 views

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 ...
Pellegatta Simone's user avatar
1 vote
2 answers
306 views

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 ...
Ehsan Ahmed Farooqi's user avatar
0 votes
2 answers
4k views

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 ...
jitter's user avatar
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0 votes
1 answer
204 views

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 ...
John's user avatar
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-1 votes
2 answers
7k views

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 ...
Matt  Sarah Hall's user avatar
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0 answers
52 views

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, ...
Chaitanya M's user avatar
1 vote
1 answer
867 views

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 ...
JoeNyland's user avatar
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0 votes
1 answer
133 views

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 ...
Sohan Arafat's user avatar
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0 answers
84 views

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&...
Thufir's user avatar
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0 votes
1 answer
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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 ...
user14110636's user avatar
0 votes
1 answer
4k views

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 ...
Nicholas Carpenedo's user avatar
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0 answers
341 views

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 ...
Phillip Hamilton's user avatar
3 votes
1 answer
13k views

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, ...
Lucas Torres's user avatar
2 votes
1 answer
5k views

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?
Vick's user avatar
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1 answer
608 views

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 ...
Vick's user avatar
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0 votes
0 answers
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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 ...
Vick's user avatar
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0 votes
5 answers
2k views

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,...
real_sm's user avatar
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0 votes
1 answer
2k views

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
Herlan K4RDU5's user avatar
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0 answers
66 views

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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