My computer will not boot off any bootable disk or even startup. I was in the middle of reinstalling Windows XP, when some how the computer shut off and now it will not boot up. It boots the pre OS boot screen, where i can select to go into the BIOS or boot from a disk. From there i select to boot from a disk and then nothing happens. The hard drive, cd, power supply, and CPU fan are all working correctly. i dont here any beeps, except one when the computer first boots up. The monitor settings are also correct and all cables look good. Any suggestions would be much appreciated!!!