HI, I suddenly have a problem with my computer. It's custom built and it ran fine for almost a year. In the morning I still used it, but in couple of hours found it to be turned off. So I turn it on, all the fans start, mobo lights up, HDD runs, but no video on the screen. And also no beep, so POST or BIOS failed. Monitor is good. Memory is good. I suspect the processor has gone bad. Or possibly motherboard. I'm clueless... It's a AMD Athlon 64 3500 AM2. MB is Asus M2N deluxe. Video is PowerColor X800 GTO. Corsair Memory 6400 (2x512).