I have a pc here that I think has a defective controller on the motherboard. The problem started when the cd rom appeared not to work, when I looked closer the secondary IDE contoller was showing a yellow exclamation mark in device properties. I tried to reload the drivers without success so I eventually decided to reload windows 98SE. I moved the cd rom to be slave to the hard drive. Once reloaded the secondary channel was installed so I naturally thought I had cracked it but when I reconnected the cd-rom to the second IDE the old problem reared its head. I have changed the cable just incase that was the problem. I can only conclude that the second IDE is faulty. My thoughts at the moment are to install a PCI IDE controller card, I cannot put the cd as slave cos there is a second hard drive. Has anyone any other ideas other than fitting the PCI card?