Hi, I'm experiencing very high/noisy fan on a Mac 3,1 2xQuad-Core Intel Xeon (2008). I've researched and I've taken the following steps: Blew out out dust generally from interior (mother board and fans without removing them) Removed video card (ATI radeon HD 2600) and checked the intake; blew out dust Removed RAM riser cards and blew out dust This lead to a quiet mac at start-up, which made me think it might be the video card dust build up as I've read elsewhere (although there wasn't that much dust on it). But 3-5 mins later the fan kicked in again very loud. Installed istatpro - 3 fans all running between 500-600rpm (the hard drive fan is running a bit faster at 800rpm). Temps all between 20ºC-29ºC with only browser running. Does this sound about ok? I haven't installed any new OS on it. Does any one have any ideas on how to narrow the problem down? Thanks in advance!