Sorry guys, I not as tech-savvy as most of you, but that's why I came to the experts. A few weeks ago, my computer crashed. A friend of mine replaced the motherboard, hard drive, and processor. It was working fine for a few weeks, then I bumped the printer cable and it shut down. I could wiggle the printer cable or mouse cable and the fans would try to run. Now it does nothing. Could this be a power supply problem or improperly grounded motherboard? Thanks for the help!