2009 iMac was overheating and now won't boot

I would post more info but I do not have it as the computer will not start.
It is an 21" iMac bought in 2010. I think around September just before the update came out.
It was overheating I noticed last week. ( i do not use this computer, my wife and children do or I would have noticed this sooner ).
3 days ago it decided not to boot up and only gives the spinning gears on the white screen.
I reset the pram, unplugged the power cord, all peripherals etc.. still no boot.
I did at one point get it to load up the recover I think it is called where you have the option to reinstall Lion and few other options.
I ran disk check, repaired the drive and tried to reboot. No luck.. same issue.
One thing when I did reset the PRAM I believe it was, the fan came on full speed and dust came flying out of the top of the iMac.
It did this while it was on and running the disk check. Once I rebooted the fan did not come back on.. or it is but on very quiet.
As I want to try to recover any files on the iMac I did not choose to reinstall LION yet.
I am not sure if it would do a new install or overwrite the existing and all files on the Hard Drive.
Any help is appreciated.
Thank you

Hi pbx77,
I am experiencing exactly the same situation as yours now.
Mine is iMac 27" was bought around 2010 also.
It was overheating almost everyday for a few weeks, and today it just hang and after we turn it off it won't boot anymore and stuck at the apple logo with rotating wheel which does rotate.
Interestingly it will heat up very fast even when we wait for this screen only about 15-20 minutes.
What happened with yours and have you resolved it and how did you resolve it?
Was your hard drive and data okay?
Thanks!

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It's time to call support and order recovery media:
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