The tag on the PC says 5200 My clock setting does not stay; it changes to different years and dates once I turn off the PC. Sometimes I cannot open documents if I am also on line; I have to turn off the PC and reboot. I am not an expert, but the only thing I can think of is that I have a low battery. I cannot find my Compaq manual to see what battery I need and how to replace it. I will appreciate your help with this. Thank you. Marilyn
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Re: I think I need to change the battery in my CPU
Hi there The Bios battery is located behind the side panel of the desktop base unit, as soon as you have opened the side panel you will see the battery straight away, just pop it out and replace it !!!
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Must be a few years old? Sounds like the on-board battery. Remove the side and locate it, change it and the machine should start. It's usually a 2032 battery.
Once changed, you may have to go into BIOS and reset the time. Usually when the computer starts from the very beginning press delete and this should bring up the BIOS screen, then change the date and time, save settings and it should boot up with no problems. A friend had exactly the same problem with a different machine.
It very hard to find the battery. You have to remove the motherboard totally from the plastic case. There is a screw under wifi microcard so you have to unscrew that first on the left hand side when you have the pc the connection side (hdi, vga, power etc) facing you. The CMOS battery is on the rear side under the side where the RAM, HD, CPU fan and the CPU is located. I managed to bend it up enough to get a screwdriver into the holder and release the battery. Good luck.
When you power up the computer press F1 or F2 or "del " key so you see bios setup screen. then check that your harddisk is dected or not .set time and date. Set first boot device as your harddrive. Then save settings and exit. Soemtimes cmos low voltage create this error so open cpu cabinet and change cmos cell . Then check. Let me know if you need more assistanse.
When it says to hit F1, keep hitting it repeatedly, you will kow it acepted it when you hear a little beep from the P.C. Case
then it should go into bios. if not, then it may not be recongnizing the keyboard.
typically this issue occures because the internal clock is off do to apower shortage or the Bios battery has dies. Its a little watch battery on the system board. If you can get into windows, check the date and time, set it and it should sync the bios clock.
Computers have an internal battery on the motherboard that helpd the board retain certain data when the computer is off. If the battery is low or dead it will cause this problem. The easiest way to replace the battery is to open the side of the computer when it is off and remove the battery from the battery holder on the motherboard. The battery looks just like a watch battery. Replace it with the same kind of battery (available at most drug stores) once you have replaced it turn on your computer and reset your clock.
This problem might be simpler than you think, check your windows clock settings includeing your time zone, if its set incorrectly it will change the time every time it syncs the clock with time servers.
If that doesn't solve the problem you might need to replace the 3 volt battery on your motherboard, also the bios might be out of sync, reseting the bios with the bios jumper (after changeing the batter) might solve the problem, you would ofcourse need to set your time in bios and all other custom settings again.
But In any case, its highly unlikely to be a fault in the motherboard.
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When prompted again hit F2 as the bios clock may be incorrect, which means your cmos battery needs changing, reset the time and save, exit for a re boot.
Take the side off the pc and look at the motherboard for a flat disc shaped watch type battery and replace if required.