Are you using 2.4.x kernel and passed the hdX=ide-scsi option at boot ? if you then your CD-ROM is /dev/sr0, you either put it in /etc/fstab as /dev/sr0 and use mount /dev/sr0 to mount it, either you make a symlink like ln -sf /dev/sr0 /dev/cdrom , add /dev/cdrom to your fstab and mount it using mount /dev/cdrom ! If you're using 2.6.x kernel, this doesn't apply.
In the case you made upgrade from kernel 2.4 to 2.6 and had the append hdX=ide-scsi option added in your /etc/lilo.conf, remove it when you boot into 2.6 kernel.
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