My unit won't read dvds dmr ez47?

My unit won't read any discs, and even when the tray is empty attempts to read a disc before failing and saying "NoREAD". The DVD disc indicator is staying on even when the tray is empty and makes a clunking noise several times before saying "NoREAD". Tray still opens and closes, but still keeps clunking and trying to read a disc every time I close it even when empty. I've tried commercially manufactured discs, blank DVD-R, recorded DVD-R, and music CD.

Problem started last night after I tried to start recording a DVD with flexible recording, but was told there was a problem with the disc and the unit automatically started a "recover" sequence. DVD has not been able to read any disc since the recover sequence ended.

Here's a list of things I've tried so far to see if I could reset:
1. Power off and back on after several minutes
2. Pressing Stop and Channel Up buttons on the front
3. Pressing and holding power button for 10-20 seconds
4. Turned off power and unplugged for approx. 7 hours
5. Played videotape in the VCR for a minute or so
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