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Old Aug 19th, 2014, 02:46 PM   #11
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A hardware problem is more likely: the hot spot (back centre/left is where the power supply is seated. Most probably a blocked fan, which may well be the case at the age of 7. Or indeed a blocked air inlet.
A 2007 iMac could be tricky to take apart for newbies. The screen cable is easily damaged. So better leave it to pros.
Unblocking the air inlet with compressed air is the only thing you could try first, Will. Can't do much damage, all components inside are sealed, or can take a lot of dust. Overheating because of blocked vent can do a lot more damage.
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Old Aug 19th, 2014, 07:16 PM   #12
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I can't recommend using smcFanControl and it has been known for goofing up a lot of Macs, besides being unreliable, especially with iMacs.

I, and several local users also often had 2007 iMacs that ran way too hot and it was resolved by installing Fan Control, and even though old, it still works well.
Fan Control for Mac | MacUpdate

I'd uninstall smcFanControl and also do a SMC Reset. Don't skip doing so.
And then after a shutdown/restart see if it runs cooler and if not, then install and setup the Fan Control Pref Pane for the various fan's speeds.
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Old Aug 19th, 2014, 08:20 PM   #13
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Well, pm-r, you've got me now! Never heard of Fan Control, or thought it was the same as SMC Fan Control! Thanks for the tip!
Not that I've used it, though, just monitor through iStat Pro. Never gone critical.
Edit: having read the link:
Quote:
For safety, it leaves the original automatic fan speed control intact.
That is where it differs from smc FanControl, it seems. The latter overrides. Seems like a dangerous bug if you use it without extreme prejudice.
Are you sure Fan Control is still Mav compatible? It seems quite old, and may even be the predecessor of smcFanControl for all I know...
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Old Aug 19th, 2014, 11:02 PM   #14
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Well hexdiy, I found the various Mac "fan controls" to be quite confusing some years ago when I really needed one for our hot running 2007 24" iMac, as most were meant for laptops and then I discovered the "Fan Control" I mentioned, and to confuse things, there were some others with the same name.

They are all from different developers and if one needs a more modern version there's Macs Fan Control which I haven't used but the comments says it works well and with mavericks:
Macs Fan Control for Mac | MacUpdate
Macs Fan Control - control fans of any Mac & Boot Camp! | CRYSTALIDEA Software

Oddly I needed to use the Fan Control with 10.6.8 on both our 24" late 2007 and 27" late 2011 iMac, but not when running 10.9.x on the 27" iMac. But I am using iStat Menus "Active Set" to boost the speed with 10.9.x on the 27" iMac but it doesn't always seem to do anything and needs to be reset often, especially after a restart or clean boot.

If one quits using a fan control pref pane, a SMC Reset should be done on the Mac to get the fans back to "normal", which is mentioned in their FAQ.
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