I quite like my 17" USB2.0 G4 iMac but the fan (or maybe their hard drive... Pretty sure it's the fan) is quite loud. Is there a way to clean it or I am better off ebaying a replacement? I opened it up a while back and replaced the DVD drive, it was dust as all hell so I gave it a dusting off but it's still noisy so I'm guessing replace it? Then again I didn't take it off its little bracket so maybe I could clean it better?