I need help with my PC.It stopped working. I got 1 blue screen of death, the it shut off. I turn it back on, start a virus scan, min later, blue screen of death. I turn it back on. My screen wont come on. I tested both graphics cards, I tested the ram, and I tested the hard drive, and I tested the monitor, They all work fine. Why won't my computer boot up anymore. Like I turn it on, CPU is kinda reving a little bit, and just stays there, Won't boot up. No matter how ;long I leave it it there. Anyone have any ideas?