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Asus A8V CMOS CHECKSUM BAD

K

KheeWhee

Member
After changing a few things in the BIOS, it did not post. After clearing the Cmos with the mobo jumper after removing the battery, now it gives me a message CMOS checksum bad.
I tried everything from reflashing using afudos. reflasing using F2 wfile posting. Nothing doing, i still get the same thing.
I can go into windows using F2 to load defaults, but i cannot save anything in the bios.
How do i get rid of this very anoying error?
I tried reflashinf to version 8, then 9 no difference.
 
Have checked the battery. Cleared the cmos with the jumper with the battery out and the power plug out.
When i get to windows HTT is 200mhz instead of 1000. I cannot seem to be able to set bios and save the settings. Probably because there is a checksum error.??
 
How did you check the battery?

I think you need to move the jumper with the power on to clear the CMOS, although removing the battery and unplugging certainly would have cleared it.
 
With a voltmeter it states 3,05 volts.
The machine worked for over 1 month before this.
Did not changed anything except some little things in the bios, then it would not post.
It posts only if i unplug the computer for a while, otherwise it does not post.
 
When I was first setting up my A8V with the 3400 I found that I had to flash the bios or else it wouldn't post after saving bios settings. Have you tried unplugging all of your other components to see if there might be a short somewhere and that your fans are running at full speed? I have heard that the A8V won't post if the fans aren't running.
 
Have tried all that.
Take my cpu out of the socket.
Take the rams out
take the video card out.
take battery out.
reset bios
reversed the process.
No go. Still that checksum bad that prevents me to update the bios via natural way.
I am having quite a difficult time to just post. I have to unplug the power cord, wait for a while anf give it a try. It posts once in 5 tries about. Then it gives me the choice F1 to enter bios or F2 to continue.
If i choose F1, then after saving the bios, it just does not restart.
If i choose F2 then it enters windows fine.
 
Finally found the problem. One pin on the cpu qot a bit bent when i installed the heatsink. After fixing it under a microscope, reinserted the cpu and heatsink. All is fine.
 
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