cheryl: I installed a new HD, so the cable could very well be out of order, will have to reopen the case soon.
edX: nope, no luck on that one... it reads no CD's, and this behaviour started (?) when I inserted a burned disk with some backups...
Sidenote: I'm in contact with Matsushita personnel now, and they have been helpful: first they told me to contact apple, but when I replied that I had no extended warranty, they mailed me their service contacts address... currently I'm inquiring about alternative drives to fit in... namel CR-177B which is currently in production.