Temps causing problems? 24" iMac, mid-2007

I have an iMac that started having possible heat issues about 3-4 months ago. After it boots up or wakes up from being asleep, within a few minutes, the CPU fan will slowly speed up to around 3300 rpm and stay there the entire time the computer is running. If my kids use it for playing games on, the screen will eventually go black and I have to press and hold the power button to shut it off and restart it.
I am looking at the temps through iStat Pro, but I dont know if any of these are abnormally high.
The iMac is currently running at 3300rpm and here are the current temps. All that has occured is the iMac was booted up, I watched iStat, then opened Safari to type this email. The CPU is running at around 5% utilization.
Temps are in celsius.
iMac HD: 30
CPU: 41
Airport card: 44
Ambient: 29
GPU: 97
GPU diode: 116
GPU Heatsink: 115
HD Bay: 42
Would this indicate a logic board problem? I have taken the iMac apart and cleaned all the dust from inside very good and the problem persists.

Hi James. It has been a while since I did this, so I am going from memory, but this is what I did.
I checked prices of a brand new GPU w/heatsink from Apple, and it was incredibly expensive.
So I started trolling through Craigslist and ebay and finally found someone selling a used heatsink without the GPU for my model of iMac. I bought it for $5 on ebay. I thought it was an incredible deal, and I wouldnt waste much if it didnt work.
So I got the replacement heatsink and bought some thermal paste off Amazon that everyone recommended. It was called Artic Silver.
Once the heatsink and thermal paste came in, I tore it all apart using instructions I found on ifixit.com
Here is the site I used to figure out how to tear it apart:
http://www.ifixit.com/Guide/Replacing+iMac+Intel+24-Inch+EMC+2111+GPU+Assembly/5 214/1
This is the thermal paste I bought:
http://www.amazon.com/dp/B0002EQU6C
Once I did all of this, I reassembled it (breaking my infrared sensor in the process) back, turned it on, and all the problems I was once having completely went away.
Here is what I dont know. I dont know what was really bad. It could have been a bad bonding with the thermal paste. It was all cracked and dried out on the old heatsink, so maybe just re-pasting it would have worked?
It could have also been the thermal sensors that are built in to the heatsink as well. I had no way of testing whether they were working or not.
All I know is that by replacing the heatsink and re-thermal-pasting it, my iMac is now back to normal.
I hope this helps.

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