Hmmm i use my (DEL) key to go into Bios...and sometimes a real biGYour may have to clear CMOS.....BUT First try turning system on / off three times with out going into windows boot, wait about 5-10seconds between each cycle and on the third time after it cycles on with single beep, then press and hold the (del )key till it enters Bios... If anything i would say its memory related you will most likely have to reset CMOS....Always make shure the Power is off unpluged during a CMOS Clear,It is so easy to do even ...... i just pictured that stupid caveman comercial,crap. It only takes a sneeze to ruin a good Bios Chip while putting that 1-2 pin short back on..

Hope that helps...