David, I had a very similar problem a couple of years ago with a different model of Mac. My problem turned out to be a faulty heat sensor on the logicboard. NextByte in Nedlands fixed it. It was still under warranty at the time, so I can't tell you what the cost was.
Good luck with it. Bill Chesnutt. On 15/06/2012, at 4:37 pm, David Noel wrote: > Can anyone advise re a fan problem? I powered down my iMac (2 GHz > Intel Core 2 Duo, OSX 10.6.8) this morning, and when I powered it on > again, immediately the fan started and is quite noisy. Generally I > can't even hear the fan. > > I powered down and up a couple of times (once with a 2-hour wait), and > each time the fan starts up when powering up. I checked the temps with > iStat Pro, the only setting is HD = 27 deg. > > David Noel > 2012 Jun 15 > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> William Chesnutt Barrister Counsels Chambers Level 3, 533 Hay Street Perth WA 6000. Phone: (08) 9221 6868. -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
