Superdrive recognizing CDs but not recognizing DVD-Rs and rejects them

Within the last few weeks my superdrive will not recognize any DVD-Rs. I have tried several blanks and and a few video DVD-Rs that I read previously. My drive is not a Pioneer but is a Sony (see below). Anyone have any suggestions.
SONY DVD RW DW-U10A:
Firmware Revision: A43i
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 8192 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -RW, +R, +RW
Burn Underrun Protection CD: Yes
Burn Underrun Protection DVD: Yes
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: No

Nick,Here's a couple of things to try:
Update to 10.4.7 (Use Apple Menu > Software Update).
Use a drive cleaning disk (The tolerances for DVDs are much tighter than CDs so dust could be the culprit).
kind regards
mrtotes

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