why won't my iBook G4 (mac os x 10.5.8) read my blank DVD's? The dvds that i tried with are blue.. may that have something to do with it..? 
MAT****A CD-RW CW-8124:
Firmware Revision: DB0D
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw
Media: Insert media and refresh to show available burn speeds