My computer doesn't work, no matter what. Okay, first I installed a motherboard/p4 1.4ghz/256 sdram combo. It ran fine before with the p2 motherboard setup and all, then it never worked right. Now it won't do anything. You turn it on, and it just sits there with the black screen. Everything is hooked up right as far as cables and such goes. When I installed the motherboard, I thought it was a simple plug-n-play type thing. I guess not. Do I have to configure the motherboard somehow? Or is there something I was supposed to setup? The motherboard is a biostar something or another. Any help would be appreciated!!!