Disc is jammed. Unplug. Use phillips screwdriver & remove 2 screws on either side & 2 screws on rear. Remove cover. Plug back in. *use care to avoid electric shock* Turn on. Using your finger slide the mechanical apparatus that is located on top of the transport, at same time depress eject button for single disc drawer. The disc will open up. Now you will be able to remove the 6-disc cartridge using the same method. At this time you will probably notice that one disc tray is missing, that is the jammed disc. Look closely & you will see it. Fiddling with it will loosen it up & it can be removed. After that it should work just fine. Good luck.