CMOS Checksum Error

[themonkey39]

Hi all.

My computer has crashed and is now displaying "CMOS Checksum Error: Defaults Loaded", at start-up. It's giving me the option to press F1 to Continue or Delete to enter set-up. Only problem, is that there is no response when I press either of these (PS2 Connection, not USB).

I have tried swtiching the jumpers, replaced the battery, removed all cables and cleared my fans out, yet nothing. I have also tried my motherboards' recovery disk in which should be bootable and still there is no response. The computer has worked faithfully for over 18 months now, and I haven't updated the BIOS or upgraded the system recently.

I have been told that it could be the RAM that needs replacing, but would rather have a professional opinion before spending

Cheers Guys, really appreciated!

System:
Asus M2N4-SLI
AMD Athlon 64 X2 4200
1x 1Gb DDR2-533
1x 120gb HDD (With OS)
1x 500gb HDD
Asus 256mb GeForce 7300