Currently Being ModeratedApr 3, 2013 6:12 AM (in response to Eddhmr)
Do some basics such as removing the RAM cover and vacuuming out any dust that may have accumulated. DO NOT blow into the machine, vacuum. You don't say how warm it gets so please be specific, you can download iStatPro for free and that will tell you actual temps.
Also don't be afraid to do some basic resets, resetting the SMC and PRAM (2 x each) would be a good start too. You can find instructions by clicking Intel iMac SMC and PRAM resets
Currently Being ModeratedApr 3, 2013 6:30 AM (in response to rkaufmann87)
Thanks for all that help Rkaufmann, will run through those now and let you know where I get to with them.
Currently Being ModeratedApr 3, 2013 7:17 AM (in response to rkaufmann87)
So, the vacuuming and SMC/ PRAM restarts seem to have helped. I've got the machine back on now and it's less sluggish. Still a slight 'whirr' but less than before. I've installed iStatPro so hopefully that'll be able to give some useful information as well in terms of temperature. Thanks again for the help!
Just to double check then my initial idea that it could a power supply problem was way off base?
Currently Being ModeratedApr 3, 2013 7:22 AM (in response to Eddhmr)
Power issues are possible, I am not familiar with any power issues in France though but I am sure they exist in some areas. One thing I'd strongly recommend is using a UPS to protect against power issues.