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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Update BIOS using Hirens Boot cd

My Dell inspiron n5010 seems dead, and I've tried everything (checking the RAM is in place, make sure all connections are secured, try another charger - also dell), and battery is still not charging ...
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Lenovo t400 s7 cmos

Hi my battery is dying dead and now my ac power is intermittent. It will start and run on ac and battery for a few hours but dies. It will not run on ac alone, although the power light flashes. Now ...
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Saving Bios Firmware, Reflashing it with new defaults

Is there anyway that I can backup my current BIOS firmware, alter the default values and then re-flash it to the BIOS chip? I mean when I remove the battery, the setting that I have defined will be ...
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157 views

Asus X99-Deluxe - Can only boot with the “Clear CMOS” button after cooler installation

It sounds like I have similar symptoms to this question, but this only started happening after swapping out a heatsink for a cooler. To be precise, the system will only boot if I press the clear CMOS ...
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42 views

Some CMOS Settings Not Retained on Reboot. Battery good

Some CMOS Settings Not Retained System: Dell Inspiron 546 Motherboard: DELL F896N 0896N Experience: Advanced Issue: Some CMOS settings are not retained after saving and reboot. Some CMOS / BIOS ...
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1answer
52 views

How can I find the cause of a system freeze recurring after CMOS battery change?

My family's computer is freezing every time it is used, ever since I changed the CMOS battery. I've tried many things in vain, and I don't know what to do anymore. I'm looking for theories and a fresh ...
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1answer
33 views

PC Stuck on verifying DMI pool - taken many steps

I have an old computer I am attempting to restore. It's a msi 945g series chipset board. I began with no POST beeps and no monitor signal being detected. I have.... Removed, Cleaned and Reseated ...
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34 views

Forget previous employers domain

How can I get my laptop to forget the domain of my previous employer? This user account seems to be running some sort of batch file (which I can't find) to connect up to network drives and printers ...
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3answers
1k views

“Please enter SETUP to recover BIOS setting” message on boot

When I boot the PC it gives the following error: Please enter SETUP to recover BIOS setting Press F1 to run SETUP Press F2 to load default values and continue I have tried to set these ...
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54 views

CMOS battery issue

The 5+ year old CMOS battery in my PC died and the BIOS lost it's settings. I replaced the battery but the same problem persists. As soon as I plug the PC into the power outlet, I get 4 beeps ...
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19 views

Is there a way to find out how many memory cells on a SSD are broken [duplicate]

A Solid-state drive consists of Flash-EEPROM (electrically erasable programmable read only memory) which is is build up of FGMOS (Floating-Gate metal–oxide–semiconductor field-effect transistor). With ...
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23 views

acer aspire z5600 erratic screen issue

Can;t select time zone; screen drop panel will not go to the bottom; can't select time zone; whatever I would select when successful is ignored; in troubleshooting, decided it could be my cmos ...
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1answer
31 views

CMOS settings failure on every power on

I'm getting "corrupt CMOS settings" message on every power on. Tried to replace the CMOS battery with new one, it didn't help. Ideas?
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1answer
34 views

Changing CMOS battery on Dell Optiplex 280

I have an old Dell optiplex 280 and its cmos battery just died. Please can someone tell me if I change its battery the bios will be lost? or only the bios settings will be lost (which are already lost ...
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1answer
291 views

CMOS checksum error after upgrading BIOS and clearing CMOS

The system is a Gateway DX4831-3, with a MB.GAJ09.001 motherboard. The updated BIOS is revision P01.B1, downloaded from Gateway's website in the support/drivers section. I was able to flash the BIOS ...
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147 views

cmos jumper location on a toshiba satellite p75-a7200

Where is the cmos jumper located on a Toshiba satellite p75-a7200 laptop computer? I have taken out the battery but can not find where the cmos jumper reset is located on the motherboard.
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2answers
104 views

How the PC boots even after the CMOS battery failure?

Whenever I do switch on, my pc boots straightaway. It doesnt wait for me to press the Power button. When I plug the cable and power on, computer also automatically gets powered. So I replaced the CMOS ...
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2answers
87 views

How to fake having a CMOS battery for RTC

I have an embedded computer running Ubuntu Server 14.04 that has no CMOS battery (temporary, I hope) so it always boots to December 31, 2008 ... Currently I'm developing an application that depends on ...
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97 views

Laptop losing time when shut off

I have a laptop with Win 7 that is losing time. The laptop's battery has been lost and so the laptop works when plugged in. The time displayed by Windows continues ticking forward at the desired pace ...
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1answer
205 views

Where is the CMOS setup utility stored?

I am reading an old A+ certification book that is going over BIOS and CMOS. Some background info (this may all very well be incorrect): From what I understand, BIOS is a set of programs on the ...
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2answers
124 views

Is it possible to brick a computer due to corrupted CMOS?

Does the BIOS do error checking before booting with the CMOS configurations? Or does it blindly take whatever inside the CMOS and try to boot with it?
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1answer
122 views

CMOS editor on Windows?

I need some way to modify BIOS settings in the CMOS memory from within Windows. Particularly I want to change the "state after power failure" setting through a remote VNC connection. Mainboard: ASUS ...
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3answers
352 views

Is clearing CMOS and flashing BIOS same operation?

My friends' desktop PC won't boot, shows nothing on display, confirmed that everything's working fine, but BIOS is corrupted..need to flash the BIOS using bootable CD/USB (Hiren's boot CD or Ultimate ...
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2answers
198 views

CMOS failure MSI motherboard

I recently tried to get an old MSI P965 Neo motherboard working, but the cmos is getting cleared every time i boot the pc. I tried a new 2032 3v battery, but it still wasnt working. I can get into the ...
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1answer
237 views

What are the negative effects of a flat CMOS battery?

Recently I have noticed that my computer has been starting up with the time and date incorrect. Given that my motherboard is about 7 years old I'm guessing that the CMOS battery is flat (or close to ...
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241 views

CMOS battery lifespan

How long does it take for a CMOS battery to STOP working since the first instance of a failure. For example, if a CMOS battery fails on Jan 1, but then works without problem until May 1 (four months ...
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3answers
7k views

Forgotten BIOS supervisor password--Lenovo B570

I've tried everything possible to reset the supervisor password on my Lenovo B570 laptop: looking for a non-existent CMOS battery, trying to run some of those software tools that are supposed to give ...
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102 views

PC Black Screen After BIOS Screen?

I booted my PC and after the BIOS screen which says F12 for bios setup and all the other options, I get black screen. I can't access bios options because when I press the button, it just shows me ...
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1k views

I have dell inspiron 545 desktop. It won't start up unless I remove the bios battery

I have dell inspiron 545 desktop. It won't start up unless I remove the bios battery. The issue first appeared 2 days ago. I left computer a few hours and when I got back the screen was black,lamp ...
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1answer
208 views

What is the rationale behind the default values for adjtimex --adjust?

The adjtimex utility has an --adjust mode that can be used to compare the system clock with the CMOS clock, calculate suggested values for the tick and frequency offset kernel time variables, and ...
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336 views

PC won't start unless I reset CMOS

Situation: My PC is dead in the water. Both power buttons (Case/MB) have no effect. If I pull the power cable, reset CMOS, reconnect the power cable, then press either power button the PC fires right ...
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3answers
71 views

BIOS settings changed unexpectedly

Here's what happened: Desktop working perfectly (playing SuperTuxKart on Linux Mint). Power down (computer left unattended, no one home). After about 3.5 hours - power up. Linux Mint starts up ...
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1answer
218 views

How to REALLY enter setup on ASUS K75DE?

I really have no idea what's going on here. I have an ASUS K75DE and both official manual and the official site says the Setup key is F2, however no matter how fast I smash the key constantly, nothing ...
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4k views

What does this beep code mean?

When I wanted to start my laptop today (an Acer Aspire 8920G), the laptop started beeping. I know this beeping is a POST error code, but I can not figure out which one it is. The motherboard of the ...
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3answers
4k views

Can't get into CMOS setup on MSI MB 970a-g46

I can't seem to get to bios any more. barely see the MSI logo flash by, no setup message that I see that I've read about. The delete button is access to it. This is an MSI 970a-g46 motherboard, ...
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91 views

Checksum Bad error on boot

Recently I inserted a new 2GB ram in my motherboard, and got Checksum Bad error on bootup. Upon reading other forums I assumed my CMOS battery must have been dead. I replace this with a new one and ...
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4answers
880 views

CMOS Battery recharged [duplicate]

My pc was unused for several months(its a 5 year old acer desktop) and on boot up a screen came up indicating that the CMOS battery was low. Any time I restarted, as expected, the same screen came up ...
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2k views

What is a “cmos checksum bad” error?

Two days back when I booted my system up, it was showing a screen with a bunch of messages and instructed to press F12 to continue booting. Two times it showed up when I booted my system and now it ...
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3answers
853 views

In linux, how to find whether CMOS battery is working or not?

I want to programatically determine whether CMOS battery is working or not. In my C++ program on linux I want to connect to internet and update system time if CMOS battery is not present or not ...
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1answer
582 views

CMOS Failure message after monitor enters power save mode

Interesting problem I've got going on - I have a Biostar TZ77B motherboard. This morning I awoke to a computer that POSTed successfully but wouldn't display anything on screen. I finally removed my ...
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452 views

Windows 7 clock gets stuck and internet disconnects

Few hours after every synchronization of the Windows clock with an internet server, it gets stuck. Along with it (I don't know the exact timing), the internet disconnects. Reconnecting (with or ...
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1answer
56 views

What parts do I need to RMA? I made a TON of careless mistakes upgrading. Motherboard fried for sure, not sure what else [closed]

Ok, so I have a asrock extreme3gen3, core i5, 5 case fans, 2ssd, 2hdd, 1cdrom. I have screwed up so many times doing this upgrade, I need some help sorting it out. I had a 560ti which I overclocked ...
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2answers
203 views

My computer runs fine until it shuts down. Then it needs to be unplugged before it will start again [closed]

Once started, it will run fine, for days on end. But once it shuts down, restart after an auto update for instance, it dies. When I try to start the computer, the fans sputter a little, but never get ...
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1answer
159 views

cleared cmos and now computer restarts when windows is starting up

I cleared the cmos as suggested for some problem that I had with hardware and changed the RAM place to another slot, and now windows wont start, it goes till the message WINDOWS IS STARTING (I use ...
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3answers
2k views

Checking NVRAM on BootUp

I've recently encountered with my desktop the other day. the problems were like this Computer boots up. and Shows this Message F1 for Setup and Configuration F2 to load default values ...
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1answer
336 views

New motherboard BSODs and now will not boot

Just built a new computer and placed an old hard drive with windows 7 from it into the new system to boot off. It booted but when Windows started it blue screened. I didn't get the code as the writing ...
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1answer
109 views

CMOS Battery. Forgot to put it in

Well. I am a complete idiot. I had to replace my keyboard. And the only way to do that was to completely take it apart. While I was at it I was going to replace my CMOS battery. I took it out. Went to ...
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384 views

Asrock Z77 Pro4-M BIOS Clock stopped

My windows clock is slow when I am using an application. When I go into my BIOS the clock is stopped all together. When I first got the board I had an issue with the time running extremely fast ...
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1answer
115 views

Changing CMOS battery Compaq 1234

How do I locate and change the CMOS battery in HP Compaq Presario 1234?
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4k views

“CMOS check sum error” while booting

I am using an HCL desktop system (Core 2 Duo, 1 GB RAM, Windows XP SP2). While booting I got the following message. CMOS check sum error. Press f1 to continue When pressing F1 it is working ...