I've actually tried all of those already. Nothing worked. I just now took the drastic approach. I tried installing the OS again on a new drive, and the dvd drive did not work even then. All I got was the Intel Boot agent making line after line of dots across the screen. When I plugged in the USB drive, then it detected the disc. That's pretty definitive-I've been blaming Windows, and its' the motherboard that's the problem. I updated the bios, but the problem persists. The bios detects the drive during boot, but the drive will not run.