SteveOBHave said:Whip it out of your PC and then blow back through the cooler blower and see if any dust comes out.
dun said:Yep, and you haven't put the heating on or something have you? It sounds daft but bit odd to explain if you have checked the normal problems inside the computer itself.
Check for dust
Check the fan is at 100% or whatever it is usually
Check the fan is free spinning and not being hindered by a cable or other random crap.
Check the ambient temperature
Check the motherboard and cpu temps see if they have risen.