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I've deleted everything and re-installed the OS. It's still doing it, so I think it's got to be something inside the iMac :(
 
Hi everyone!

I just wanted to thank you all for your great advice.

I've had a friend come round and they think it's dust in the mac, because it's heating up.

So they're going to take it to their shop and try and fix it!

Thank you all very, very much! :D
 
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