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There should be a small hole on the door of the disk tray. insert a paper clip in the hole to manually open the disk tray. remove the disk and see if the tray will open and close normally. If it does put another disk in and see if all is well. If not I would have a repair center look at it.
I took a stake knife from the kitchen and pried open the tray door as I hit the eject button this got it to open, I then cycled eject and close, eject close a few times and this did the trick, I even played a DVD and that worked fine also. I had the problem with the tray not opening, and the display would read OPEN when I hit eject and I could hear it trying to open. So I wanted to make sure the tray wasn't just stuck or wedged before I took the system apart and looked for sripped out plastic gears or the belt being broken. GoodLuck email@example.com
You can either buy cd's with brush mountet on it or you can DO IT YOU SELF remove cover (carefull, high voltage inside, and laser product: so protect your eyes ) and clean the laser with some watter, or other cleaning liquid products?
I had this MSG 04 problem. Opened the player up. Messed around. Figured out that the 5-disc tray was hanging up a little during the initialization.
The issue is that the tray screws into and rotates around a stand-up beam. On the underside of the tray are gear teeth which are spun by a gear on the main unit underneath. The real culprit is the stand-up beam in the very middle. It is too long.
The fix is to first try just tightening the middle black screw holding the tray onto the stand-up beam. If this tightens and MSG 04 goes away, you're done. If it does not tighten at all or much at all, then remove the screw (actually a bolt) and using a razor or sharp blade, scrape the top 1/4 millimeter off the stand-up beam. Apply some grease around the beam and on top.
Note, you may have to remove the tray to do all this. If so, that is the most tricky part. Carefully lift on the tray on the front side as you rotate it. Try to free a disc circle edge over the top of the front DVD cover and free the tray. To re-set the tray, put it on the stand up beam with the front side of the tray slanted up and slowly rotate while setting it in and down.
After re-seating the tray, screw the bolt down but do not tighten all the way. Tighten it enough to allow rotation and enough to rid the msg 04 problem.
I shaved my stand-up beam and have never seen a MSG 04 since.