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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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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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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No display/keyboard on a laptop, external keyboards/display works (CMOS error, battery replaced but not working)

Laptop has been getting CMOS battery error, however, I have replaced the batteries already. Previously, replacing the battery would sustain the internal monitor and keyboard for a long period of time ...
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Hp Pavillion all in one shows 0 sign of life

Cant stress enough how i have tried everything!! , I have got to the point were i stripped it down to the bare motherboard. This still shows no sign of life and can not find voltage anywhere on the ...
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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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34 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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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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185 views

pc won't wake up from sleep mode - power button wont work

I got new AMD Ryzen 2700 and Asus TUF-X470 mobo. I swapped windows HD from my old system i7. Windows works fine however when I try to use sleep mode it goes to sleep permanently. Only resetting CMOS ...
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243 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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281 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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214 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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1k 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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5k 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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101 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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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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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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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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5k views

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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1k 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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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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91 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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648 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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1k 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....
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906 views

No display after CMOS and BIOS reset

I've got a very weird problem here, sorry to have such a specific case but I'm not sure what to do at this point. So, this is for context I don't think it's related to the problem: I had this problem ...
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620 views

Why does removing the CMOS Battery reset settings / time?

Why does the act of removing the CMOS battery reset BIOS settings and/or clear date and time settings? The settings are probably not stored "in the battery"...
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721 views

Blue screen error after replacing CMOS battery

I have two problems with my desktop. 1. CMOS battery down hence date and time reset every time after PC shutdown. 2. Display does not appear with beep sound. I have tried by removing RAM and ...
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398 views

Prolonged time with dead CMOS battery

Today my CMOS battery died (typical symptoms: date reset on cold boot, asked to press F1 on startup) I already have a replacement, however I would really like to avoid changing it, as my motherboard ...
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78 views

Does a bios flash count as a CMOS reset?

Does a BIOS reflash count as a CMOS reset, I would like to know because I cannot get new ram to work on my laptop which worked on it before. I would not like to clear the CMOS... Short backstory: I ...
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1answer
47 views

Is there an un-bypassable way to protect my bios settings?

Is there a way to protect my bios settings beyond any sort of method of bypassing? I just set a long bios password but if it as easy as merely removing the CMOS battery to bypass the password, what ...
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1answer
2k views

Frustrating ACPI BIOS ERROR at boot. HP 15-G019WM UEFI laptop

I have a HP 15 with UEFI & AMD processor from a client that just won't boot from any bootable media. "Your Pc ran into a problem and needs to restart Error: ACPI BIOS Error." Prior to the error ...
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70 views

PS boots into Bios screen after it has been powered off

My problem If my PC is turned off for an extended period of time (not restarted, or turned back on within 30 or so seconds of a full shutdown) Then my PC will boot to the initial ASUS bios screen ...
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392 views

What used to happen when the non-rechargeable CMOS battery ran out?

I'm taking a uni course on electrical engineering and my textbook says that the CMOS battery used to last between 2 and 10 years. Since preserving BIOS settings seems quite important to me, I was ...
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866 views

Motherboard not providing output or giving beeps

This is an email I sent to the ASRock motherboard company's support email address. My motherboard will power my heatsink fan, my led's, the powerbutton, and even my SSD. I am getting no output from ...
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Motherboard won't boot up after windows 10 network driver installation

So after installing windows 10, the computer was working fine and I was able to use it and all but when we went to install the network driver for windows 10, it froze and then turned off. I've got ...
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833 views

What else can cause PC clock delay, if CMOS battery and RTC module seems OK?

I have a Acer Veriton N260G Series PC nettop with motherbord labelled as All In One Motherboard GN40S01-1.0-KSH GN40S01 or All In One Motherboard MB.VA309.002. Computer's clocks is getting very late ...
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What does a CMOS chip look like?

I'm trying to figure out the difference between BIOS and CMOS. I always thought the BIOS setup was software installed onto the CMOS chip. According to this video, the BIOS and CMOS are both chips. ...