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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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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12 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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28 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
23 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
95 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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89 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
67 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
67 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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58 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
106 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
100 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
91 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
187 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
123 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
142 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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166 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
5k 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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97 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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1answer
858 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
173 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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288 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
70 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
151 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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2answers
3k 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
3k 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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79 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
581 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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1k 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
724 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
504 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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1answer
367 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
55 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
172 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
151 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
322 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
101 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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360 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
112 views

Changing CMOS battery Compaq 1234

How do I locate and change the CMOS battery in HP Compaq Presario 1234?
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2answers
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 ...
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1answer
505 views

What “TYPE” of harddrive is in my old 286

I have a very old(1989?) 80286 computer. I can tell it was a very good machine in it's day. It has a harddrive installed. I finally got a PS/2 to AT keyboard plug today and got it to boot. Now I ...
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4answers
14k views

Remove BIOS password on netbook

A friend of mine asked me me to fix her daughters netbook. It has a BOOTMNG missing error, so I decided to install windows again. But, windows is not installing, because the BIOS has a password, and ...
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185 views

046 MHW Real Time Clock Failure

I'm currently in the process of rebuilding a computer from Alienware computer pieces. The motherboard itself is 046 MHW, and on boot it gives 5 beeps without any actual booting. This indicates a Real ...
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136 views

Asus n61Ja notebook bios update

I wanted to update the bios, with an official bios update, from version 207 to 211. I didn't use winflash, I used easyflash in the bios. Everything seemed to be going okay; it deleted the old files, ...
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2answers
1k views

BIOS not fully ACPI compliant - P4VP-MX

My BIOS got reverted and I'm freaking out. (I think this was due to me replacing my CMOS). My PC is showing funny symbols instead of normal texts. So I thought I have to reformat and reinstall windows ...
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4answers
10k views

How long does CMOS battery (3V) on a motherboard last?

Just wondering usually how long does CMOS battery last on a regular motherboard? I read that motherboard leakage current of about 3 - 6 micro ampere. I did a calculation below but I believe that i ...
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303 views

I have to clear CMOS to Boot

The problem I have is that I need to remove the CMOS battery so the computer would turn on. It appears to be dead, I press the power button and it does absolutely nothing, no lights on, no beeping, ...
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1answer
55 views

System Turning off, when power on? (Intel 101D MB, Intel Dual Core, Windows 7 32-bit)

I Cleaned my system multiple times in past, today also i did the same thing. When i try to Power on my System, i am able to see the Intel Processor Boot screen(able to hear Beap sound) and after 1min ...
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133 views

Clearing the CMOS fixed my computer but I want to know why it was necessary

After a shutdown my PC would turn on, but would not boot (nothing appeared on the monitor). I cleared the CMOS on my motherboard via the jumper, and then was able to enter the BIOS setup menu and ...
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2answers
321 views

Why are my video cards heating up when my machines won't boot or pass POST?

I have three machines with the exact same hardware and the exact same problem. After I push the power button, the CPU fan runs continuously at a high speed rather than spinning down to a low speed. ...