CMOS/GPNV CHECKSUM bad

March 18, 2010 at 09:31:32
Specs: Windows xP
When I start my PC I get the mesages "CMOS/GPNV CHECKSUM bad" and "CMOS date/time not set" "Press F4 to run setup" and when I exit setup, windows logo appears but again CMOS error appears and so on.
I need help in this regard. Is my CMOS BATTERY EXHAUSTED?

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#1
March 18, 2010 at 09:55:44
Yes, it is. Replace the battery and reboot and press F4. Check the time and date and other BIOS settings, save them and reboot.

Stuart


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#2
March 18, 2010 at 13:28:33
If you have NOT recently
- flashed the bios
- removed the battery from a desktop mboard and replaced it the right way, with the + showing
- cleared cmos by moving a jumper on a desktop mboard then movng it back

then yes, the Cmos battery is either dead or too weak, or if you have a desktop computer, it has poor connection in it's socket - one connection contact is bent and is not touching the battery, or there is corrosion in the socket.

Do you have a desktop computer, or a laptop or netbook computer?
It's easy to replace the battery on a desktop computer. It's usually a coin shaped shiny chrome or similar plated round button cell in a socket on the mboard. Replace it with the same type, or a clone of it. When it's installed you must have the + on the battery showing.
If it's a laptop or netbook computer, HP has Maintenance manuals for most of their laptop and netbook computers available for the model or model series that you can look at online or download. In that it will show you where the cmos battery is and how to remove and install it. Once you have un-installed it or have read it's label you can use it's part number to search on the web for the proper replacement cmos battery. NOTE that sometimes the battery is soldered to mboard.
Or - you could go here and look up which part number your Cmos battery has:
http://partsurfer.hp.com/search.aspx
.......

If you HAVE recently

- flashed the bios - the message is normal, after you have rebooted after flashing - if you DO NOT also see Boot Block Bios or similar - go into the bios, set the date and time, save bios settings, and you should not get the message while booting again.

- removed the battery from a desktop mboard, if you replaced it the wrong way, with the + NOT showing when it's installed, you merely have to flip the battery over in it's socket, then you can go into the bios, set the date and time, save bios settings, and you should not get the message while booting again.
If you still get the message, the Cmos battery is either dead or too weak, or if you have a desktop computer, it has poor connection in it's socket - one connection contact is bent and is not touching the battery, or there is corrosion in the socket.

- cleared cmos by moving a jumper on a desktop mboard then movng it back, then rthe message is normal the next time you boot the computer. Go into the bios, set the date and time, save bios settings, and you should not get the message while booting again.
........

If you see CMOS/GPNV CHECKSUM bad etc. AND Boot Block Bios, or similar, then you must have attempted to flash the bios and the flash has FAILED. You MAY be able to recover from that situation, if you use the RIGHT bios update, and you flash the bios the RIGHT way, by following a specific Recovery procedure.


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