Having just had the sound sorted on my laptop thanks to Fruit Bat, I noticed in the device manager that the disk drive had an exclaimation mark over it. I tried putting a DVD in it, and it didn't pick it up.
I haven't tampered with it in any way, so I'm sure its a software/driver issue. In the device manager I have tried to rollback drivers, with no success, and also uninstalled and then went down the Add New Hardware route, it picked it up and installed drivers but again, the exclaimation mark is still there.
The laptop is on XP, and the drive is called a mat*!@:a uj-850d. I tried googling for drivers but didn't have any luck.