Will not recognize DVDs, including the new OS X Snow Leopard install disk

I just got a used, year-old Macbook Pro and it will not read DVDs and was brought to my attention when I tried to install the new OS X 10.6 and it would make noises like it was trying to read the disk, and then it ejects the disk every time I try. I tried multiple DVDs and it did the same **** for everything I put in. It reads CDs completely fine and even burns CDs but for some reason it does not read DVDs. Any suggestions are very helpful.

Not recognizing / mounting discs: I used to think this was a cleaning issue, and found myself removing my optical drives, taking them apart, and cleaning the lenses, etc. whenever the problem occurred. Then one time decided to simply disconnect the drives, restarting the system with the drives disconnected, then shutting down, reconnecting the drives, and restarting... bam. Drives were good to go, the problem fixed- discs mounting just fine. Apparently it wasn't the "cleaning" I was doing, it was the disconnect / reconnect that was fixing it. I don't bother cleaning them any more. Now I just do the disconnect/reconnect dance. I would consider this as being something related to the SMC, except the same issue existed with my G5, which did not utilize the SMC function as with the Intel machines.

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