Internal fanskeep running. How do I stop this?

I have had trouble with Safari stop working then desktop freezes. I can still move mouse but nothing can be actioned.
I switched  iMac off while keeping power button held in. Unplugged power cable at back of monitor, then kept power button held in.
I reinserted power cable then iMac rebooted fine. Except internal fans keep staying on now.
I have rebooted iMac but they still stay on!!
PLease help.
Jamiehaggis.

Have you a temperature monitor to see whether the Mac is, in fact, overheating?  You can get a free widget called iStat which will tell you how hot your machine is getting.  You might also want to reset the PRAM

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