I have been working on a friends desktop. It is a dell 2400 system. Some time ago the cd rom drive (Samsung sc-148A) started making a scratchy sound over the speakers when an audio CD is played. It almost sounds like the sound is slightly slower too. The other drive plays the same cd perfectly. He did a restore back a few months and it went away. Now it's back again. I want to find the root of the problem. It runs on the OS generic IDE drivers, so I guess I can't reinstall the drivers. No errors in Device Manager. Everyone says to check the DMA. It is enabled and I even disabled it for a test. The drive has been set for digital audio and also disabled for testing. I checked the cables, even though an earlier restor fixed it. I am going to tear my hair out!! I ran IDE diagonstics from bios and the hard drive passes, but the secondary CD rom and the other CDRW come up "diagonstics nots supported". What do I do now? Please help me I am about to give up!! Thanks. 
