Replace the battery and make sure it has a good connection in it's seat. Download and reflash the BIOS
again. The original download file may have been corrpted. If those
steps don't fix it then there are only a couple remaining things that
could be happening:
1) Bad CMOS memory chip. This does happen.
It's a small, couple K battery backed chip. The chip itself, mainboard
tracings or circuitry leading to it could go bad or be defective.
2) Mainboard is shorting on the case somewhere. The tracings on the
mainboard can definately short/ground or have periodic shorts causing
the cmos memory to become corrupt.
3) Something electromagnetic is effecting the CMOS memory. A poorly
shielded fan or other magnetic source is wiping out the CMOS memory
periodically. You don't have like a refridgerator magnet on the side of
the case do you? :D
4) Temperature. If for some reason your mainboard has a hot-spot,
excessive temperatures for the CMOS chip can cause it's contents to
scramble.
5) Unstable power. If one of your voltage rails from the PSU is bad,
it can wipe CMOS memory contents. Get a hardware monitor and let it run
to watch voltage ranges.
6) BIOS virus. Some virus attack the BIOS/CMOS memory space. Run a
full scan and if you cannot afford a good virus program, try AVIRA. Even
if your system comes up clean, look for patterns in usage (like a
particular CD you use when it happens, etc.etc.)
I'd say it's most likely just a bad chip/mainboard. I've seen this before.
Good Luck!
SOURCE: cmos checksum error defaults loaded
Make sure the battery your using is brand new. If it is then go ahead and get into the Bios and make sure the date and time is set properly. Once you do that then go ahead and save the changes and exit.
After this go ahead and see if the CMOS exit checksum defaults comes up if not then go ahead and turn off the computer and unplug it. Then after about 5 minutues plug the computer back up and turn it on and if the message doesn't come up then its resolved.
If the cmos checksum error comes back up then try a brand new battery, should be a 2032 battery and then go thru the same steps in setting the date and time and save changes and exit and if the message doesn't come back then unplug the system again and leave it unplugged for 5 minutes. Now plug it back up and if the message stays away the problem is resolved. it the message comes back then that means the motherboard isn't reconizing the batteries and the motherboard would need to be replaced.
SOURCE: Soyo KT400L-2AA5 Motherboard - CMOS checksum error - Defaults loa
This message is usually accompanied by another more explicit, like: "Memory changed from 1GB to 2GB. Press F1 to continue". The message should display and go away after pressing F1. Since you cannot press F1 because the keys do nothing, chances are your keyboard is disconnected, which should display a message indicating this failure.
Try pressing the ScrLk (Scroll Lock) key as messages are being displayed to catch all
messages (they go by quickly) and stop them before they disappear.
If that's the case, then reconnect the keyboard and try again.
Good luck!
SOURCE: Ref GA-81PE1000L Error message on boot up
all the computer bios settings are stored even when the computer is off (like time and fsb)
these are stored due to the help of a cmos battery
when this battery finishes it gives the CMOS Checksum error Default loaded error
all you need to do is replace the cmos cell
it is a mercury cell (looks like a silver coin) and will be placed on your motherboard
it is very very cheap so go buy one and replace it and be happy
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SOURCE: y have a GA 81845GV motherboard. on boot sequence
Most likely the MoBo battery more info here
http://www.pcguide.com/ts/x/sys/booterrGBER08-c.html
SOURCE: gigabyte ga-8ld533 mother board problem
i have a problem with my mother bord 8ld533.my head phone is not working properly also its working with a small sound,alredy a have installed my sound driver..can you help me please...
In the main or system setup screen you should be able to see the date and time Using your arrow keys navigate to the date and change the date. Once highlighted on the month, day, or year, press your arrow keys or your page up / page down keys to change the date.
hope this helps you
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