ASROCK K7S8XE - boot problem

Question

ASROCK K7S8XE motherboard with Athlon 2500 XP+ Running XP Pro, SP2 System won't reboot until you reboot it 4 times (that's a hard reset using the main power switch) Upon the fourth reboot the POST stuff comes up with a message to the effect that "The system has been unable to boot several times, hit F2 key to enter BIOS". Then the system comes up fine. I can't find anything obvious in the BIOS settings...Help!?!