My brother has a rebuilt (I rebuilt it) HP comp. It's not a new problem, but it solved itself last time. Just replaced the power supply, and that solved it's weird boot. Even though it no longer just turns on the fans, it POSTS three times, and I can't remember the model of the mobo. It's a Q9550 Intel Core 2 Quad 2.83 GHz, and nothing AT ALL shows on the screen during the boot. It's a (I know it works fine) XFX AMD Radeon HD 4890 1 GB. It's POST is three times. Any help? Would replacing the motherboard help?