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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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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39 views

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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43 views

Laptop BIOS Corrupted with No BIOS Update?

So I turned on my laptop today only to discover my laptop was restoring the bios, meaning the bios got corrupted. I never have done a bios update on this laptop, so I am wondering how did the bios get ...
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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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1answer
26 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 ...
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28 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 ...
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2answers
91 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 ...
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2answers
625 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 ...
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1answer
77 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 ...
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683 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 ...
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Stuborn BIOS password, wont reset on MX945 mainboard

I have tried every combination, read the manual several times, removed the cpu battery, rebooted, powered off, swapped the jumpers with or without the bios battery, looked closely at the mainboard, ...
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30 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, ...
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1answer
89 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 ...
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26 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 ...
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73 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&...
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44 views

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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What could cause filesystem (EXT4) inconsistencies? Can exhausted CMOS battery be the cause?

There is a desktop PC which suffers continually from EXT4 filesystem inconsistencies. The PC does not boot up. I use fsck to repair the filesystem. The PC works fine again, after some time the ...
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2k 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 ...
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176 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 ...
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1answer
6k 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, ...
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1answer
3k 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?
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258 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 ...
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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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921 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
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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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2answers
479 views

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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1answer
429 views

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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97 views

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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1answer
78 views

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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2k views

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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238 views

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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172 views

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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179 views

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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173 views

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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1answer
279 views

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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1answer
1k views

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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1answer
300 views

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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2k views

how-to-reset-remove-bios-password-on-the-hp-stream 14 0ax [duplicate]

There was a user named Moab that stated he could generate an admin pw from the code it spits out after 3 failed attempts, can anyone still do this for me? I am desperate (helping a friend). My code is:...
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86 views

Windows 8.1 Sony vaio with no CMOS battery

I have an issue with one of my screws that prevents me from opening my PC for any hardware maintenance; therefore, I can't plug the CMOS battery back. Why I removed the battery? I had forgotten my ...
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2k views

Unable to boot to BIOS screen (Uefi blank black screen)

I have recently been unable to access my uefi bios i think it is since upgrading to windows 10 but im not sure I used to be able to access the bios fine but it was a while since i have changed my ...
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1answer
69 views

Will a failing CMOS battery prevent my laptop from booting (90% of time)?

My old Gateway P-170L laptop (circa 2005) fails to boot 90+% of the time. It will usually freeze up at the initial Windows logo screen. After numerous restarts it may completely boot and continue to ...
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2answers
129 views

Mainboard seemingly has infinite power

So I've played around with the OC settings on my mainboard (have done so quite a few times in the past). Only this time Windows locked up and didn't want to boot. As is recommended, I've gone and ...
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2answers
15k views

Do modern laptops with non-removable battery still retain the CMOS battery?

Today, laptops with non-removable batteries are becoming more and more common due to a pressure to make laptops lighterweight and thinner. Historically, computers have had a CMOS battery to operate ...
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1answer
205 views

Does computer on or connected to mains deplete CMOS battery?

Computers have a CMOS battery to operate the real-time clock and retain BIOS settings. There are two ways in which the CMOS battery can fail: either it is past its shelf life or alternatively its ...
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hp pavillion a1630n wont boot after ram upgrade

would really appreciate some help with this: I added 2gb ddr2 ram to an old pavilion a1630n for the 4gb max amount. After adding the new ram, the computer will only occasionally boot into windows. ...
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1answer
78 views

Laptop dies in seconds

I've recently revived an Acer Aspire One 531h. I installed Linux set up couple of things for a few days and now, suddenly, when I press the power button, the machine displays the regular press F2 POST ...
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117 views

Reset CMOS/BIOS

I've got an old Fusitsu Esprimo Q1510. The BIOS is corrupted, so I need to reset it. I've read the manuals on the Fujitsu website, but I can't find any information on how to do this. How do I fix it?...
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93 views

Blank screen on boot, even with onboard graphics

So I have a custom-built PC with an Intel motherboard, an Intel i5 processor and a GTX 560 Ti connected via a PCIe x16 slot. Whenever I turn on the computer with the graphics card plugged in, my ...