Hello, I'm new to the forums and I hope you can help me. About 6 weeks ago I built my first custom PC, here are the specs: Intel Core 2 Duo E8200 2.66Ghz ASUS P5N-E SLI Motherboard Corsair 2GB RAM 800Mhz (1GB x 2) XFX GeForce 8800GT 512MB GPU Antec EarthWatts 500W PSU Windows XP Professional The PC was running fine until a few weeks ago, I got a blue screen while I was using Firefox. This happened a few times and I could restart the PC and it would be fine. At first I ignored it but it happened again, the PC would restart when Windows loaded up and do this a few times until it would be stable so to speak. Today the same thing happened when I switched on the PC so I let it restart and choose Last Known Good Configuration, it was running fine for a while until I got another blue screen which looked like a 0x07, the PC restarted and I got the message Disk Boot Failure Insert System Disk and Press Enter. I don't have a floppy drive so I can't boot via floppy so I went into BIOS to set CD as first boot priority when I realized that none of my devices were detected in BIOS. I have a SATA DVD drive and Hard Drive but they weren't showing in BIOS. I tried using a HD from my old PC with Windows on it. BIOS detected it under Primary IDE and when I tried to load it I got a boot screen with Safe Mode, Safe Mode with Networking etc. I tried Start Windows Normally, Safe Mode, Safe with Networking and Last Known Good Configuration but each time I would get a brief blue screen and the PC would restart immediately. Your help would be appreciated, please let me know if there is anything else you need to know.