[and, yes, I've looked at the other answers on this <grin>]
I have a Abit KT7-RAID board with AMD Athlon 800Mhz. It has worked flawlessly for about a year. The other day, my son was playing a game when the computer froze on him. It was locked solid so he reset it and it booted with this message and a single low-tone:
BIOS Checksum error
Then it told me to insert a system disk and press a key.
NOTE: The standard "press DEL" message does not come up but it did continue to support my AGP card (believe it or not) until I flashed the BIOS then I had to put in a PCI card (which works).
I have reflashed the BIOS three times -- once with the same level, once with the latest, and once again with the same level that was on it. No change even though all flashes reported success in the process.
Even though it said BIOS checksum, I reset the CMOS (30 seconds). No difference. I checked the battery voltage -- 3 volts. I ran CLRCMOS to clear the CMOS values. No difference.
So, thinking the BIOS chip must be fried, I bought an aftermarket BIOS from Unicore and swapped it in. NO DIFFERENCE.
I am running out of ideas on this. I've contact the board manufacturer and Award but neither has bothered to even respond. I have never run into this error before and would really value some one helping me to solve it.