Recently my PSU has begun to buzz under heavy load, it's silent when in normal use, and in some scenarios where it's not being stressed too much, but in scenarios where it's really being pushed it emits an electrical buzzing sound, which can be heard over the fans.
Is this a sign that it will fail soon? It has been in pretty much constant use for around 5 years.
The model is an Antec Earthwatts 520.
I've been doing some reading and I think it may be the noise of the capacitors discharging, which apparently does not pose any problem, but I'd like to confirm it, as of course PSU failure can be pretty catastrophic.