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Mine is quiet in terms of fans - well, I've been used to using a powerbook only for the last couple of years, but when I got my powermac some of my brothers friends were round and commented how quiet it was for such a beast of a machine.

However, mine seems to have developed a strange chirping noise... Gets worse when I turn power settings down... I've also tried turning NAP on and off, anyone got any ideas?
 
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