So, the SuperDrive can write to CDs and play them. However, it won't read DVDs. We're talking about officially licensed ones and not homemade burned stuff. I've tried two so far. I've already repaired disk permissions and verified them afterwards: I've also reset the PRAM and NVRAM with no luck. It doesn't even appear in Disk Utility, but it still works... If someone knows about firmware that can fix the problem, can you give me details on how to apply it? That's unless it's the usual DMG format of course. By the way, this used to be a school computer, which could have a lot to do with the problem. Half of iLife was already missing, and the cache was a mess. It's running 10.4.11 still. Terminal commands are well welcomed.