Hi there, I have a self made PC with Winfast Foxconn MB, AMD64 3000+ socket 754, ATI 9250 AGP. I installed everything, connected the cables but the computer does not turn on. I receive a blank screen and nothing else. The MB and proccesor worked previously on a different system that I have upgraded. What can it be? The FANs are working, I can not turn it off from the power button. Please help me.