This really a crossover question. I rebuilt my wife's older system, and the only hardware I kept in the case was two optical drives and one hard drive, all three being PATA or IDE. Since the mobo only had one IDE connector, I used it for the optical drives. For the hard drive, I bought one of those adapters that plugs into the back of it and gives you a conversion to enable you to hook the hard drive up to a SATA connector on the mobo. The machine boots up fine giving one short beep but cannot find the hard drive. I went into the BIOS and changed boot priority putting the hard drive first. Any ideas what I'm missing besides just buy a SATA hard drive? XP is already on the hard drive, and I was hoping to just slip right into Windows without any hassle.