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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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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Grub2 won't boot Windows 7 after power was out in sleep mode

I'm running dual boot Windows 7 N (on SSD) and Ubuntu 18 (on HDD) with GRUB 2 as boot manager. After putting Windows into sleep mode I pulled the plug. Today, when I put the plug back, there was a ...
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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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555 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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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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How to access BIOS on a power-on password-protected system?

I have a HP Pavilion and I want to access BIOS. I currently can't, due to the PC booting straight past the 'Press the ESC key' after I enter the power-on password. I have tried various means to reset ...
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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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Ram upgrade fail

So recently, I got a 2x4 Gb ram from Corsair (CMX8GX3M2A1333C9) to upgrade my mobo. I had 2x2Gb ram (NT28C64B88B0NF-CG). But now my motherboard (Asrock G41MH/USB3 rev 2) is not booting anymore. It is ...
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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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damaged motherboard? Networking and RTC not working on Thinkpad x230

I have been upgrading a pretty battered x230 - coreboot and me_cleaner, new ssd, more ram. Now I think - maybe - I've damaged the motherboard. (This is Lubuntu on 18.10, but also tried on 18.04.02, ...
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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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226 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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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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271 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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739 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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263 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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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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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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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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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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12k 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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164 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
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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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90 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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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 ...
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101 views

Laptop doesn't work after replacing RAM

I have a Dell E6430 laptop with 4GB of RAM. I replaced it with 2x4GB modules. After that the laptop turns on, checks the DVD drive, doesn't beep, doesn't show anything on the screen (no access to BIOS)...
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Can you remove the CMOS battery from a powered computer?

I want to take out the CMOS battery while my machine was working to check how much charge it had left in it and I'm curious whether it's going to whack my CMOS settings. Does the BIOS chip draw power ...
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2k views

How to undo fastboot disable and CSM enable option in BIOS? currently have no display. Is clearing CMOS my only option?

So I just disabled fast boot and enabled CSM boot in order to try and get a windows 10 install USB to boot. The system won't boot now and I have no display. Is CMOS reset my only option in this case?...
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Gigabyte H110M-S2PV-CF (DDR4) not booting, needs CMOS reset to boot again

Once in 2 or 3 days, I need to reset CMOS of my new PC just to boot. Otherwise it just won't boot. Even power lights won't light up. I tried many things to solve this. Here is the list. 1. I checked ...
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2answers
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Delay in startup after pressing power button of desktop computer

It took me a while to find my solution, so I thought I would post my problem and solution here. The problem: The computer sometimes only turns on after a delay. After I press the PC's power button ...
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Windows Wont boot up after clearing CMOS

I cleared my cmos and windows cant boot up. it says inaccessible_boot_device how can i fix this? btw im using a ssd for windows and a hdd for other stuff
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What is the equivalent of “cat /dev/nvram > backup.cmos” in Windows?

On some Linux systems, it is possible to dump BIOS CMOS raw data using cat /dev/nvram > backup.cmos. What is the equivalent of this command on Windows?
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Wipe windows 10 info from bios or cmos

I've read that windows 10 writes it's registration/configuration information into the bios (or was it cmos...) of your motherboard to close the loop of using the same product key as both a dual boot ...
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1answer
127 views

Computer inconsistently boots

So my problem is that I've built a tower out of older hardware to run DOS/DOS games on, it has 512MB of RAM, its using onboard VGA video output, one 5200RPM IDE HDD, and one SATA DVD drive. Now as the ...
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PC is not starting properly

I've changed the case on my pc and now if I plug in and power straight away the power light and fans start but then stop completely. To get it to boot properly I carry out the following steps: ...
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3answers
1k views

Will reboot without CMOS battery cause BIOS reset? (If laptop is plugged in)

I have an odd situation, where my CMOS battery case has broken, so the battery is fine, but it gets disloged, and my computer doesn't boot with default BIOS Settings. Non-UEFI. So far I have managed ...
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2k views

Thinkpad T410 not booting: Simple solution?

I have a Lenovo Thinkpad T410 which I left outdoors overnight after a BBQ... No rain but likely some humidity. Symptoms? - Initially, screen remains black, nothing happens upon pressing power button....