When my PC boots, it gives the following error message "CPU is unworkable or has been changed. Please re-check" "F1 to continue of DEL to enter setup" If I press F1 the system boots normally but with default bios settings. If I enter the correct settings the computer hangs. The fans and drives work but the screen stays blank. Would a dead bios battery give these symptoms? email address is fake. Sorry if this appears twice. System: Mboard Abit KD7 Raid CPU Athlon XP 2800 Bios ver DN Memory 256 MB DDR333 512 MB DDR333 IDE 1 Maxtor 120 GB Maxtor 40 GB IDE 2 Pioneer DVD-RW DVR-107D DVD ROM 40x