OK first thing you need to do is open up hte case and make sure the FAn is turning. Second thing is if it's turning look beneath the fan to check the fins on the Heatsink are not blocked.
If they are fine you may have to reseat the CPU with new compound. However you will need to get some from somewhere. Ideally Artic Silver or equivilent. Dont forget to clean both CPU and Underneath of heatsink first with a Citrus Based cleaner or something suitable for the job. I dont recommend Meths
Let us know how you get on
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