My iMac is making a louder that usual sound when in use - any suggestions to get it to chill out a bit?!

It's a low whirring, I'm sure it's louder than it used to be and it definitely gets louder the more windows I have open, or applications are running, iTunes with Photoshop and Safari etc. causes it to get much louder. It's not the actual fan as far as I can tell, the other day I put it to sleep and it instead froze and the fan was really loud in that case and I just had to turn it off at the back.
I tried repairing the disk permissions, it's made no difference. I can't see anything out of place it Activity Monitor but I might be wrong about that.
Is it a case of the Mac getting too hot, or just that it's nearly 6 years old?!
Any suggestions would be great, thanks.

First, make sure that all your air vents are free of dust and lint.
Then,try http://support.apple.com/kb/HT1436 Resetting SMU
After that, if you do not have an iSight, open the back and look for bulging or leaking caps (the little soda can). It's likely that either some caps are bad or your power supply unit is failing. Go to User>Applications>Utilities>Console and type in maximum temperature in the little box at the top right of Console. If you see any heat messages, then your problem is likely what I suggested.

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rodeored828 wrote:
Will HP fix this, where and how do I send this producty in to be fixed?
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My iMac is making a louder that usual sound when in use - any suggestions to get it to chill out a bit?!

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