Hi, I bought a 3.7 GHz Quad-Core Mac Pro direct from Apple at the beginning of April this year - I'm a musician and have been away on tour for the last few months and, quite unbelievably and somewhat ashamedly, have only just properly set it up for recording in my home studio (I'm also getting back into producing with some work having just come in). It's replacing an iMac I bought 5 years ago, which quite simply was having a problem with large projects. What I've noticed is constant fan noise, basically a whirring sound - I wouldn't say it's that bad or extreme, but I understood that these models were whisper quiet, and it's noticeable when you're standing a few feet away. By comparison, my iMac was quieter. Bearing in mind how much I paid for it, it's not good enough, and not exactly suitable for the purposes I require it for (it's imperative that I have a quiet computer so that operational noise won't be picked up by mics). I'm also concerned that if I have projects that are CPU-intensive, the fan noise will only get worse. I ran the Diagnostics test and no issues were found - what was weird was near the end of the test, what I presume was fan noise increased to the extent where it sounded like a kettle having just boiled! Is that something that would happen as part of the test? I'd appreciate any ideas or feedback.