then its definitely not working. i suggest you stop using the pc immediately. the power supply can get very damaged and damage other pieces of your pc when it does overheat. if you want help fixing it, check out the site in my signature.
just replace the fan, its very easy and if you want help then just register on my site which only takes like 1 minute to do. if you dont want to bother fixing it, DEFINITELY REPLACE the psu ASAP