Quote from bowserchomp
This thread made me facepalm...
Seriously, this guy has a freaking PowerPC iBook for Christ's sake! There's no way in hell that thing can run anything today, let alone Minecraft. The computer is too old (they stopped making them in 2006), the architecture is not supported at all (PowerPC), and the system cannot run any OS X version newer than Leopard.
I swear to you, I have a running version of Minecraft on my Ibook G4. BTW this is not my main gaming computer, I use this mostly for Facebook.