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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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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2answers
237 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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32 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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139 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
60 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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94 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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2answers
56 views

Computer hardware

Here's what happened: Desktop working perfectly (playing supertuxkart on linuxmint). Power down (computer left unattended, no one home). After about 3.5 hours - power up. Linux Mint starts up almost ...
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1answer
51 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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1answer
56 views

if removing BIOS from Lenovo G77 laptop, how does is it with the truecript installed

I have have a BIOS password, windows password and truecript on my laptop. Just wondered if the BIOS was reset by removing the CMOS battery, would it then be possible to bypass the windows password ...
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2answers
1k 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
936 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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47 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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3answers
145 views

CMOS Battery recharged

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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1answer
639 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
408 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
299 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
166 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
52 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
126 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
94 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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2answers
638 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
270 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
89 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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274 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
95 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
2k 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
385 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
10k 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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172 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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127 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
941 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
5k 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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295 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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0answers
128 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
295 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. ...
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4answers
10k views

How to reset BIOS on ASUS F5?

My BIOS is password-protected, so that I can't access the BIOS settings (I don't have problems with booting into Windows XP). The BIOS is made by American Megatrends (AMI). I've been trying some ...
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2answers
511 views

Monitor is blank (no signal)

Custom built desktop computer. It was working fine (used as a server), but I needed to change the IP address, so for the heck of it, I went into the BIOS and: Loaded factory defaults Changed video ...
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1answer
606 views

How can I restore my Lenovo T500 to Switchable Graphics without being able to see the screen?

I changed my Lenovo T500 from 'Switchable Graphics' to 'Discrete Graphics' in the BIOS. Now I don't get any display out on the internal LCD, or an external VGA monitor. Not even the POST screen. How ...
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557 views

How do I reset the CMOS in a Lenovo T500?

I've got my Lenovo T500 in a state where the display output doesn't work. I want to reset the CMOS to factory defaults. I have removed the keyboard, disconnected the internal battery and counted to ...
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1answer
2k views

Corrupt BIOS and no post screen

I have an Asus m2n sli deluxe mainboard. I ran the Asus update utility (wish I didn't, it is buggy) and it started to loop (my OS is Windows 7 Pro 64-bit). after 15 minutes, I restarted my PC. as I ...
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8answers
5k views

How can a CMOS battery store data?

How does a CMOS battery store information on it? I know it stores information such as the time, date, passwords and drive configuration, but how? How can a battery store data?
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1answer
610 views

No POST, No Display, Fans Spin, LEDs On

I have an Acer Aspire M5641 that won't boot. First, the onboard video stopped working; I bought a new compatible video card and connected it but it made no difference. I started some deeper analysis - ...
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2answers
6k views

is a CMOS battery rechargable?

if so, how does it's recharger look like?
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2answers
12k views

Computer hangs at BIOS screen. Cannot enter setup

I have an HP Pavilion a6500f (it's a year out of warranty) and it's hanging on the blue HP BIOS screen. If I mash F10 while it's starting up, it will say "Entering Setup..." but I will see no results. ...
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2answers
1k views

HP Compaq T5000 won't power up

So, just took an unused HP Compaq T5000 out of storage, originally bought in 2006, so thought I'd power it up and look into how I could repurpose it at home.... except that it wont start up :( When I ...
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2answers
831 views

Computer only boots when CMOS set to Clear

I just put this computer together yesterday, and I finally had to go to bed last night. The computer only boots when it the clear cmos jumper is set to clear. This is really strange. I have tried to ...
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4answers
289 views

Home server clock runs too fast

I have a Debian server running on some hardware from ca 2004, and the real time clock is running too fast. I have set it to run ntpdate every hour, so the clock is mostly correct, but this seems kinda ...
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2answers
2k views

Laptop BIOS clock resets on reboot?

I have a fairly new Sony Vaio laptop that had some power problems, and they put in a new motherboard yesterday. It fixed my old problems, but now the clock is acting weird. The BIOS clock gets reset ...
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3answers
4k views

Two short beeps and nothing on the monitor

I am building a small Mini-ITX computer. But I can not make it boot. When I start the computer I hear two short beeps from the motherboard and nothing is shown on the monitor. How can I fix this? ...