My system has an odd problem. I turn it on, and within seconds I lose audio and video. The power light to the console stays on, but all video and audio is lost. I can't even make it all the way through the bootup screen. I've checked all my cables already, so I really dunno what's causing it. It also seems that the GD-ROM drive spins up for just a second and then spins right back down. However, the cooling fan runs continually. Any ideas?