fedora 9 and DVD-ROM drive

hello one and all,

i have fedora 9 on a celeron 2.8 GHz machine. it was booting fine, then i installed an ide DVD-ROM drive in place of one of the two CD-ROM drive. i left one CD-ROM drive in. the DVD drive is jumped to master and the CD drive to slave. not everytime, but most of the time, fedora will hang and put the monitor in sleep mode. it does this when the boot sequence first goes from an ascii screen to a gui screen mode. in fact, when the gui screen mode is initializing, it starts with a mouse cursor X and then goes to the rotating pointer thing. when it hangs it will go to the X and never get to the rotating pointer thing, that is when the monitor will go into sleep mode and the computer is dead at that point. any suggestions?