OK, bare with me, I am very new to the mac world. Here is my problem: I own a PowerBook G4, with the DVD/CDRW combo drive. My drive will play DVD's, or any cd that I have burned (either on my old PC, or on my mac), but it will not play any CD that I have purchased, including music cd's from the store, driver cd's for peripherals, etc. What is wrong with my powerbook? Am I simply not doing something right, or is my Mac screwed up? It seems like if a drive will read burned cd's, and any DVD thrown its way, it should read any other cd as well, what is my problem? Any help would be great!