MacBook Pro won't mount *2nd* DVD until after reboot.

MacBookPro5,1, Intel Core 2 Duo,  2.53 GHz, 4G ram, Mac OS 10.6.8
This MacBook Pro will not mount more than 1 DVD without a reboot in between discs!
These are commercial movie DVD's in excellent condition.
I can mount and watch one commercial DVD with no problems, but when I eject that disc after viewing and insert another commercial disc, it will not mount. I can hear the drive spin up, then spin down, then spin up again, etc... eventually the Finder takes over and says that I've inserted a blank disc and do I want to ininialize?
Eject command does not work while this spin up/spin down loop is occurring. If I Shut Down before the Finder finally recognizes there's a disc in trouble, then reboot and hold the trackpad button, the disc will eject. If I then trash all DVD preferences, the disc will mount and eject on command.
Inserting another disc will result in failure to mount! Etc...
Any ideas?

I should have updated this ages ago. Sorry.
The solution to the problem was to remove the DVD drive, take the cover off it and clean the lens in the reader mechanism. Just Google up the disassembly directions for your particular Mac model.
Downhillracer1's solution, compressed air blown in through the disc slot is certainly easier and might do the trick if all you've got is a spec of dust on the lens, but if it's a problem with some kind of film deposited, opening it up and cleaning the lens is more thorough.
My DVD drive now reads and burns with no problem.

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