Hi Tom! If your cd shows up in dos and in your boot, and you have a ! mark on Ide controller singl fifo. I think you may have the NYB boot sector virus. I just fixed a computer with the exact same problem last week. First run Mcaffee or another virus scan to confirm virus. Then boot with a known good boot disk that is write protected. Then type fdisk/mbr and your cd will be back. The way you get this virus is by booting with a infected boot disk. Good Luck! Don Trippel Don's Electronics Rosthern Sask Canada Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.