first of all look at your /etc/fstab file to see what device is your cd-rom and where its mount point, if the CD-rom is primary slave it is hdb, if secondary master hdc and secondary slave is hdd
try the following
mount -tiso9660 /dev/hdx /mnt/cdrom
substitute x with appropriate letter b, c or d ( I don't think you have your cd-rom as primary master, do you?)
make sure mount point exists ( /mnt/cdrom in this example), if it doesn't create it, become root and
mkdir /mnt/cdrom
or whatever you want to call it
and as root you can make a symbolic link /dev/cdrom
such
ln -s /dev/hdx /dev/cdrom
Again substitute the x with appropriate entry, if you are not sure which device is your cd-rom do as root
dmesg|less
and look for initialization of your drives somewhere in the begining.
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