I put my x800pro@xt up to 520/590 and it seemed to handle it fine so I left it scanning for artifacts overnight. I woke up this morning and screen was blank . Restarted. Beep Beeep Beepbeep. (same sound as with no graphics card). The fan starts up and the heatsink gets warm though. It wont start in any other computer either. Plz help I've modded this card way too much to send it back. HELP!!