Hi, has anyone any ideas why all of a sudden a cd drive will not read the disc. Upon trying to explore a disc there it is as there is nothing in the drive, but if you leave the disc in and re-boot the disc contents are there and can be used. the PC is an older system based on a Duron 800 running XP Pro SP2. I've tried another drive, swapped IDE cables and channels and still the same. Help ??