I hav an unusual problem. My computer wont boot up att all. The PSU is in tacked and working good and the RAM is fine. I tried 2 different CPUs and the same thing happened. I turn on the computer and then the power goes on like regular but the screen never shows n e thing like its in sleep mode. It does not reconise CD's or floppy disks. Is there n e way to fix this or do i hav to buy something?