that wouldn't cause it. I belive it's either a script running or a physical problem with the drive. shut all the way down, unplug your PC, hold the power button for 5 seconds, take the side of the case off, un-plug and replug the IDE cable for your cd-rom drive at the drive and the motherboard, put everything back togetherm adn restart. Then let me know if it's still happening. Also, is it possible that something is stuck in the drive?