When I had clients who reported noises like this. Usually something was missing. Screws need tightening or drop some 10-40 oil onto the fan bearing. But today the internal fans do wear out. The more Power requires these PSU will start to make noises. Some will start to fail or just shut off on you. Sounds like your PSU is starting to go as mentioned by other member here.I`m having a problem with my PSU it makes a Buzzy sound "very low sound you have to get near it to hear " , but what is weird that the sound doesn`t stop even after shutting down the PC or switching the PSU off , i have to disconnect the electricity completely from the PC .
is this normal ?
I've successfully oiled many noisy PSU fans, and then put the grommet seal and sticker back onWe do not recommend a drop oil on a power supply fan bearing. PSU bearings do not require oil on any brand or model we have examined
Buzzing noises are most often caused by coil whine, where the current passing through the wire in the coil will cause the core to vibrate at a audible frequency. This is a common problem on corsair psu's mixed with certain video cards/motherboards.I've successfully oiled many noisy PSU fans, and then put the grommet seal and sticker back on
But the Power Supply is a sealed unit that holds power even when unplugged
It is not recommended to ever service a Power Supply, and will definitely void warranty from doing so
Oh and by the way, I don't even think its the fan, I think its one of the capacitors, of which is even more dangerous