Alright so I bought a G5 2.0Ghz dualie. Aside from the mini its my first real mac. The first thing I did was open the puppy up and look at its guts. Everything seems normal except this one little box. It's been bugging me and I can't figure out what it is. Between the Optical Drive and the Hard drive bays theres a round looking plastic module with 4 little cables running into it that I haven't a clue what it is. Does anybody know? It has a cable that plugs into the motherboard, but even disconnected the machine boots. It's a bit hard to get to. Thanks in advance.