I was play a demo of "Timeshift" and put everything in the graphics department to highest setting possible, then the game froze so I restarted my computer only to have it beep and play the message "system failure cpu clock" over and over. My monitor stays blank my mouse and keyboard are inactive. my problem is that I can't get past the error message.

My computer specs are
XP home edition
3.0ghz Pentium 4
2 gigs of DDR ram
ATI Radeon 9800 256MB

See if you can identify the code here BIOS beep & POST codes

Try clearing your CMOS with the CMOS jumper on your mobo.