Quote Originally Posted by FABombjoy
If it says "no disc", it knows that the tray is closed but for whatever reason it just can't detect a disc. Could be a dirty, out of adjustment, or defective laser / laser controller.

For the front loader, IIRC if the door-closed switch doesn't engage upon closing it'll eject the tray since it interprets that as something being stuck (sorta like a gag reflex).
Thanks for the information concerning the front loaders FABombjoy!