These things are very tempermental. Try disconnecting the power by pulling the plug in the back. Then plug it back in and see if it works. If that fails, try plugging it back in while holding the "eject" button down. If that doesn't work, try pitching it in a dumpster.

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1992 Black 500e
1991 Black 300te 4m
1992 Black Renntech 620sl
1979 Porsche 911sc targa