CMOS Checksum Error

[sbailey]

When booting up a computer, I receive a CMOS Checksum error and the computer locks. I have tried to get into the CMOS setup to "load the optimal settings", but the setup also locks. Any ideas?

[sjs74]

Check your jumper settings. If you have your bus speed too high or the wrong voltage you can experience lockups during post.

[jpcasagrande]

If you've got an AMD processor you may need a patch avalable from their web site. Processor is too fast for Microsoft Win'95.

[sbailey]

Thanks- I have an Intel processor, I will have to try the jumper settings.

[slogo]

sounds to me like ur mobo batt. died replace the battery on the mobo, then set the bios up again hope this helps

[philipg]

I encountered this on a friends computer your ram chips are mismatched or you have large edo chips with a generic type chip or vice versa.
Try switching around your memory boards and also try them in different slots or try half of them installed and if and when you get it to post look at the info screen for bank 0 or bank 1 and see what it says you may not be able to combine certain boards together.

My friend's computer had 4 simm slots 2-16mb(edo) and 2-4mb(FP,whatever that is) and it worked fine, but when we tried to put 2-64mb(EDO) in it won't see them came up with your message. We moved them around and still nothing tried combining them with the other boards and it would only work like this:

bank 0
slot 1-16mb edo
slot 2-16mb edo
bank 1
slot 3-64mb edo
slot 4-64mb edo

Any other combination gave us the message on your screen.
Let me know if this helped.

[sbailey]

Thanks for all the input....it was the motherboard battery. In fact it was physically split down the middle.