Fan sounds like a hairdryer after screen has been replaced...eh?

Can someone who's 'up' on imacs give me a steer here.
At the beginning of the week, with only a 14 days to go on my 3 year Applecare warranty, I noticed a grey streaky 'misting' on the screen when it was turned off. It was really quite bad.  Called Applecare, who got their servicing company to collect it, screen replaced with no problems.  Got it back today, new screen, looks great. 
So far so good.  Except that the fan is now whirling around and making an incredible noise after about 10 minutes of the machine being turned on.  I'd say it's around 5 times as loud (or hyperactive) as it was before I sent it off for a new screen.  One of the things I turned to the imac for was it's quietness, so this is worse for me than a misty screen, to be honest.  Sounds like a hairdryer.
Put it this way:  I often listen to music late at night, very low, but now the fan would drown out the sound of the music.  Called Applecare, who are going to get it collected again, but from what I've read in these forums this evening (& I'm no expert) it could be a software related problem (temperature controls and all that...)  I'm not sure that the guy I was talking to at Applecare today quite understood what I was trying to explain, and said it was definitely a hardware problem. I want to call Applecare back on Monday before the mac's collected again to just make sure it has to be carted off again, with a bit of back up info from anybody who might help here.
thanks
chris

Reset your SMC to see if that makes a difference:
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

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