IMac is very hot top half of machine

I was wondering if anyone out there has a new 24" aluminum frame iMac and has noticed that the aluminum chassis gets very hot, and I do mean hot. I was wondering whether Apple intentionally went to the aluminum frame so that it would act as a heat sink. Unfortunately I'm a little concerned this heat will hurt the longevity of the electronics in this chassis.
Any comments on similar experiences would be appreciated.
Mike

on my first day of ownership) My new 24" 2.8GHz turned itself off during an Apple automatic Software Update…
I noted that (when on) there was no discernable fan noise! Oh bitter/sweet silence!
I downloaded "Temperature Monitor 4.2" and "smcFanControl 2.1.2" (both free).
With no real activity to cause heat build-up the Power Supply was at 82 C. and the CPU core 2 was at 74 C. (only 14 C. below Intel's CPU shutdown point)!
After setting smcFanControl at about halfway along the sliders tracks, sanity returned!
Temperatures are now sensible, with the Power Supply (under medium load) at 58 degrees C. and CPU core 2 at 52 C.

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Lands End wrote:
Just got my new iMac which I am very happy with, but after an hour or so of use it runs very hot. The upper left and right corners are extremely hot-almost too hot to touch for longer than 15 seconds or so. Is this normal ?
Land End
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I installed Mountain Lion yesterday onto my mid-2010 21.5" iMac. Today, while running it normally, it got so very hot that I couldn't even touch the aluminum back. The heat could be felt through the glass on the screen.
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Hello,
I have a late iMac
Modellnamn:          iMac
Modellidentifierare:          iMac12,2
Processornamn:          Intel Core i7
Processorhastighet:          3,4 GHz
Antal processorer:          1
Totalt antal kärnor:          4
L2-cache (per kärna):          256 K
L3-cache:          8 MB
Minne:          4 GB
Boot ROM-version:          IM121.0047.B1E
SMC-version (system):          1.72f2
Serienummer (system):
Maskinvaru-UUID:
(im from Sweden)
Well, when I watch movies or play some games my computor gets really hot, almost as I can burn if I hold for a few seconds.
Since I don't know much about computor, specially since this is my first Mac. Is it the Fans not doing thier job, can I perhaps "make" them go faster or anything.
Yea so if it helps I downloaded some program that shows my temperatures, now its down to 44 but it was up to 50 before I started looking.
Thanks in advance.
Jocke

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I have a 2006 iMac that has been using smcFanControl for years. I only run the fan speeds up just high enough to control the temp's and vacuum out the air intakes faithfully every 3 month. It has never ran hot or been in for service and I feel that that is the reason that the graphic's chip and display are still alive today.

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HI,
*"Did freeze up as a safety mechanism?"* Not likely.
You aren't alone http://www.afterdawn.com/news/archive/17685.cfm
and here ... http://discussions.apple.com/thread.jspa?threadID=1978213&tstart=0
Take it back.
Carolyn

IMac is very hot top half of machine

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