I had this problem on a Volvo 960. They are making CD Changers cheaper & cheaper now, and this seemed to be the problem on the Volvo. It worked, then it wouldn't even eject the cartridge, with all my CD's stuck in it!! I took it all apart, and this is very straightforward. Just be careful, don't loose any screws, etc. Nothing will fall out. The cartridge can be manually removed. Once this is done, I lubed with a light oil every moving part i could find, staying away from the lens, of course. The CD-Changer now works perfectly. SO.....If yours fails again, take it apart and lube it. Volvo wanted $100 to fix, I don't know what yours cost. I guess mine is a "repair," while yours is "maintenance."

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro