Power supply makes a high pitched whine noise
I have a 17" Intel iMac (EMC 2124) that's producing a high pitched whine from the power supply (upper left corner).
It's evident but not very loud when plugged in but turned off. Slightly louder when running, when when shutting down it briefly gets stronger then goes quieter.
I took the computer apart and looked at the PSU, but didn't see any bulging/leaking capacitors or obvious damage.
Is this something I should be concerned about? Should I look for a replacement?
Is this a good question?