I recently replaced the CPU cooling fan in my CISNET P4 computer. Since I’ve done this the computer no longer beeps when booting and gives me an OS error. I used an Win XP disk to boot up, repartioned the master drive and reinstalled Win XP but I’m still getting the same result and I can’t access the BIOS. I can power up the computer with the Win XP disk in the drive and it’s useable that way. Do have a direction to point me in so I can troubleshoot?