Back of iMac extremely hot, temp check anyone?

Hey everyone,
I bought my iMac in Sept. of 2011. Specs are:
2.5 GHz i5
4 GB ram
Mac OS X 10.6.8
and other specs as well...
I don't use my DVD drive a lot, but when I do, it's normally when I play The Sims 3. I've noticed the back gets EXTREMELY hot, and lately my game keeps shutting down for reasons I cannot figure out. If any of you know about The Sims, I've already gone through almost every troubleshooting solution I can think of, so all I'm coming up with is that my Mac is overheating.
I downloaded the iStatPro deal to monitor my temps and they are as follows:
HD: Macintosh- 53
CPU- 45
Ambient- 31
GPU Diode- 65
GPU Heatsink- 63
Mem Controller- 60
Optical Drive- 48
Power supply 2- 54
(these are the current reads about 30 min. after the game crashed, so essentially the DVD drive hasn't been used in 30 min.)
I think these are all higher than "normal" (from what I've seen on a few other posts). Is my mac in danger of overheating? I really don't want to damage this, it's just over a year old and I can't afford to go buy a new one or even get this fixed. Any comments or advice is appreciated! Thank you so much!

Welcome to the Apple Support Communities
Your iMac works properly. Those temperatures are normal for the iMac, and games need full performance, so that's why your iMac is hot. Also, your iMac has got fans in the back

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