Hi all! I have a Graphite PowerMac G4 Dual 450, which i stripped and cleaned. Though beautiful, it's a pretty noisy machine. The fan was clogged up with dust, but is now spotless. I was wondering, is it possible to change the fan, and if so... what kinda fan am i looking at? Is there a certain model or fitting that i should be looking for? I'm assuming the noise is the fan, could it be anything else? It's like a hearing a hoover a couple of rooms away. Rich.