cant find the model number from this book. my friend told me that he either shut down the computer then it wouldnt boot, or left for the night with it running and when he came back it wouldnt boot. the fans turn on but no beeps or anything... tried clearing the cmos, didnt help. the led shows c3 which i cant find in the back, but c3h shows expand compressed bios code to dram. is his motherboard shot or cpu? i have no idea what to tell him... please help