I haven't done any major changes to the PC, so I don't understand how I've run into this problem. I power on the PC, and all I get is: BIOS ROM checksum error Detecting floppy drive A media... Drive A error. System halt The computer makes a loud, constant repetitive beeps as well. I tried getting into the BIOS but the PC doesn't even have time to get the keyboard online because this pops up right away. Any ideas?