I have recently built my friend a computer, a amd 2600 mobile oced. He has a nec dvd-cd burner and it has worked. But now for some reason the system recognizes it but it cant read any discs. I have tried using different ide cables changing jumper settings and dmas. I have had this problem before but i put in my cd drive and connected them ide and changed the dma to ultra 33 i think and it worked. I took my drive out and now i cant get it to work. Please help this is driving me crazy.