My DVD player is not reading DVDs

I have a Mac Pro running OS 10.6.8, and a Sony DVD RW DW-D150A disc drive.
My problem is that when I load DVD's into the DVD drive, sometimes I get a dialogue box that tells me that I've loaded a blank disc, even when I know I haven't.  The drive does read some DVD's, like mass-distributed stuff, but it doesn't read DVD's I've burned via DVD Studio Pro (on the same machine), or some discs that were burned on another Mac.  It's not just DVD's, either.  A client sent me a DVD with several Quicktime files on it, and I got the same message. (Fortunately, my laptop did read the disc properly).
How do I resolve this?  Any advice would be appreciated, thanks.

try a can of compressed air to clean the lens. Could be dirty. a "laser lens cleaning disc" may be helpful. Of course, I shut my Mac pro down, removed the drive, opened 'er up, cleaned the lens with isopropyl, put 'er back together, put the drive in and reconnected it, but hopefully you won't have to go that far.
Of course, the drive may be shot (hopefully not)
well, good luck...
John B

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