Asus mobo Bios error?

Hi all,
Can som1 help me?
I have a asus p5n-d mobo, that keeps giving the same error at start up " Cmoc checksum error - Defaults loaded". Ive updated the bios file from 0601 to 0801 and also changed the battery but I keep getting the same message.

Ive tried to reset the bios with the mobo cd but that aren't no help either.
If their arent anything else I can do, im thinking of getting a budget socket 1155 mobo with sli, could som1 recommended a mobo.

Thanks
 
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