If you have a another IDE cable (a standard one from a PC) it's possible to run it out of the RAM hatch on the bottom of the case and connect any CD drive like that. You should also be able to split the power out from the HD drive with a molex Y-cable or two as extenders... however as you said this didn't work before, it may be possible that the power supply doesn't have enough juice to power a full size CD drive along with the HD (which is perfectly possible since these were designed to be fairly cheap machines). It certainly should work with a full size CD drive, as I've done it in the past. However, I did use an external power supply that I scavenged from an old SCSI CD-ROM drive.
