Originally Posted by
$aunder$
Hi Clara,
Possibly a faulty fan, if you feel confident enough, you could take the side of the case off and power the pc on, take a look at the fans (cpu, northbridge, system etc) and see if any have 1) stopped or 2) look like they are spinning slow (some fans bearings fail for no reason !!).
Another reason maybe dust build up, again take the side of the case off and power the pc on, take a look at the amount of dust in the case, especially near the cpu, if it is a dust buildup, grab the hoover and give it a clean :-)
Hope this helps.
$aunder$