|How about CDs? What type of DVDs won't play? Just movies or is it all DVD disks such as game disks or software install disks etc?|
How old is the machine?
Have you run a lenscleaner through it? Is it also a burner and do you use it a lot?
How about bootable disks? Will they boot and read properly before the operating system starts up? Cannot tell from what little information you provided whether you have a hardware or software problem.
Goin' Fishin' (Some day)