I was just curious about the following on my new 2009 Mac Pro; 2.66 Quad; 3TB 640GB; 3GB Ram; ATI 512 Graphics Card: 1. How loud should it be? I think one of the noises was my hard drive rattling because the carpet it was on was uneven. I have since moved it to on top of my desk and that has subsided for now. Now it's noise is just kind of a purr, normal right? 2. How do I keep dust from getting inside? I think having it off the carpet should help that now.... 3. The bottom RAM/CPU tray does not line up properly, but the machine works fine... Ill get a pic of this up later. Basically, one side is more flush than the other side when you slide it back in, but everything locks in right. Thanks.