My drive thinks all my discs are blank!

Whenever I put a CD or DVD into my disc drive, the drive either spits it out, or spins really fast and then tells me i've inserted a blank disc or tells me "the disk you inserted was not readable by this computer". I've reset the nvram, the pram, and the PMU, and repaired permissions. If anyone can give me any help, please do. I'm not sure when this started or why, but i really want to fix it.
Thanks! Here's the specs for the drive:
MADSHIDADVD-B EJ-8#5E:
Model: MADSHIDADVD-B EJ-8#5E
Revision: GAND
Serial Number:
Detachable Drive: No
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal
All the firmware is up to date.
PowerBook G4 Mac OS X (10.4.8)

Probably ether your discs or your optical drive lens is dirty.
Use micro fiber cloths to clean the discs and test them with a different machine.
there are plently of cd lens cleaner discs but i don't know of there compatibility with compact slot loading drives so check to make sure.

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