My father gave me his old PC which he could not boot up. He took his hard drive out and a repair shop transferred his data to CDs. When I turn it on it beeps once (regular), then two short beeps, then a high tone followed by a low tone. It has Award BIOS. The two short beeps indicate a video problem, I believe. I tried two other video cards (AGP) with exactly the same result. My monitor has a small floating message "no signal connected". I cannot get the On Screen Display to work either.