make such noises. Try ferreting out the real source of the grinding noise.
Yes it could be a bad fan in the Power Supply and that should be very easy to determine. The remainder of the components in a supply are not mechanical in nature and thus can't make grinding noises..
my power supply unit has been making a loud grinding kind of noise for about a month or two and I have no idea why. it is getting very annoying. what could this sound be?