My iMac is incredibly HOT to the touch in the back.

My iMac is so hot in the back, I can't hold my hand to it for any length of time.  Im a new Mac person, is this normal for a Mac? Thanks

Do you really believe what you are writing about this?
So, all of the optical drives, hard drives, GPUs and logic board failures that get posted here ( and since I been a part of these iMac forums for over a year, there have been a lot of them) are just normal wear and tear component failures and aren't internal heat related at all, huh? And they are isolated cases?
I Call B.S.!!!
The aluminum case doesn't transfer the heat out as fast as it is being generated, internally. The fans run too slow and ramp up too late to move the heat out quick enough, either AND there is minimal outer case venting! Period.!
I own a LaCie LCD Monitor that has better rear cooling venting and that is just LCD monitor and not an AIO computer! Earlier iMac designs had much better venting systems than these newer Aluminum style models.
When I first got this iMac, mine was getting as hot as the OP's iMac. I found the fan control solution,ramped up the fans and run an external small desktop fan at the back of the iMac.
The internal fans run fast enough without the spinning noise being annoyingly loud.
I Am tired of seeing posts from all of the higher level users here telling people that the iMac getting hot, not just warm, is a normal characteristic and there should be no worry.
It simply is not true.
A Cooler running iMac is a much happier and longer lasting and longer running iMac that will, most likely, have less premature, major component failures.
If the OPs iMac is running too hot, then take whatever precautions against this as you can!
I truly believe heat is the Achilles' heel to the trouble free, long life operation of these iMacs!

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