Now I've read the question properly, I would like to change my opinion (embarassed). Mattie seems to be right: if he is adding the cdrom/cdrw to the primary ide as a master it is upsetting the hard drive (which is also set to master). He should either set it to slave on the primary ide chain or set it to master on the secondary ide (if it is the only device). Also, the hard drive may be cable select and may be upset by putting on another device as either a master/save. In this case set the hdd to master.