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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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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0answers
209 views
What does pulling the PS3 CMOS battery do? [closed]
I'm assuming it's a CMOS battery because of the resemblance to a PC motherboard's CMOS battery.
Just curious what might happen if I pull it - does it reset something? Good/Bad?
Can the CMOS battery ...
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1answer
134 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
60 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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0answers
145 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
67 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
607 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 ...
4
votes
1answer
192 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
3k 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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0answers
139 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 ...
1
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0answers
101 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
631 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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3answers
2k 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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0answers
253 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
51 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
113 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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1answer
133 views
Windows 7 will not boot without disk [closed]
When I boot my Windows 7 computer it asks for the boot disk. I put that in and it boots fine.
When I boot without it, I go into BIOS and it can see the HDD. So I boot from the disk and restart and ...
1
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2answers
261 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
6k 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 ...
7
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2answers
388 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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vote
1answer
388 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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0answers
417 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
3k 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
540 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
3k views
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2answers
7k 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
871 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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vote
2answers
635 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 ...
2
votes
4answers
257 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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votes
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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vote
3answers
3k 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?
...
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2answers
245 views
PC won't post, black screen
I was formatting some old harddrives and toying with my desktop recently and now it wont post. When I turn it on the LEDs turn on, the DVD drive has power. The harddrives seem to have power to them as ...
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2answers
876 views
Windows 7 Problems, Bad CMOS battery?
Ok heres the background on my comp. It built it all parts ordered from newegg, built back in late july. Specs on comp are as follows
Antec 850w modular ps
Corsair xms3 6gb ddr3 1600
Caviar black 1tb ...
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2answers
633 views
MSI P6N motherboard - Bad CMOS Checksum
Twice in the last month, my computer has failed to boot, or even POST, because of this message:
CMOS checksum bad
Press F1 for Setup
Press F2 for default values
When I press F2, the BIOS values ...
4
votes
1answer
577 views
Can't boot up after clearing the CMOS
My computer always ask to set CMOS set up during boot up. i think my CMOS has problem and i tried to clear the CMOS by using the jumper for clear CMOS. i did not unplug the PSU when i did this and ...
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1answer
765 views
CCD vs. CMOS webcams
Several years ago, I tried a CMOS-based webcam and it really sucked. It needed an extremely brightly-lit room to work. Around the same time, I also tried a CCD camera and it worked great. But since ...
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2answers
375 views
How can I re-program/flash a backup of the bios?
I have some computers that have a particular bios setting that keeps everything running smoothly. The setting is not the default setting for the motherboard. So, when the CMOS battery dies, the ...
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4answers
2k views
Why won't my ASUS P5MT-M motherboard allow me to enter the CMOS setup?
When the system POSTs, it doesn't display any options for entering the system setup.
The official manual for this motherboard claims that you need to press <Del> to enter setup, and I've ...
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votes
2answers
353 views
CMOS Time problem
Whenever i switch on the system an error is showing that Date & time is not correct. I have to set the time manually in bios to work the system. What is the reason for this error. How can i solve ...
