Hi, a year late, but may be of use to some one.
I had the no cd display on my dhse when - 1. it worked the day before and 2. i knew the mag was full of the right way up cd's.
bought a lense cleaner which did nothing- so removed boot sidecover and withdrew cd unit from framework. When the changer was out and still conected i tried to reload the mag with only the cleaning cd in, if you look closely between the r/h side of the mag and the player you will see that the player takes each cd in and out(working 1-6). what mine was doing was sticking on number 3, it was actually the mag door that was sticking. I revoved all the drawers, cleaned them and now everything is ok. Hope this helps . phil13