I got this annoying problem. Somehow my bios was reset and the next time i started my comp, this error appeared right after the drives were recognized. It says CMOS Checksum error,defaults loaded, press f1 to continue or del to enter setup. The problem initially was that I had a usb keyboard which would not function because usb keyboard support was reset in the bios.Obviously I couldnt get anyway. All I have to do is press f1 to solve this damn problem. So i got a regular ps2 keyboard, thinking that it would work, however to my surprise it doesnt! I tried another ps2 keyboard, same result. I am now very frustrated and annoyed. What do i do now? The two keyboards work on other pc's. Any suggestions will be appreciated.