The PSU should stop working by the time anything catastrophic happens if it's an official Nintendo one. Keep using it until you can't stand the noise anymore then get a new one.
LOL.
Nah, i've just throwed the PSU away,
May I ask how long your PSU lasted? I've been wanting to get a cheap 10 dollar Chinese PSU as I only have 1 power brick for my 3 Gamecubes.
It's either coils or caps going bad. If caps do go bad (typical in high-heat), they will filter less and less noise and keep buzzing until the capacitor is dried up. You can take it apart and recap it if you'd like, it's not a hard job.
No guarantees about the board design either, cheapo power supplies are often missing important safety components and don't have enough separation between the high voltage and low voltage side, and those are a part of the board design itself.
Why do 3rd party PSUs have to be so sketchy? It shouldn't be so difficult to obtain a PSU that isn't a fire hazard.
If you're not keen on using another 3rd party adapter and can't find a reasonably priced official one you can always just swap the connector on a Wii power brick - those tend to sell for next to nothing.
You could probably also just get a good standard 12V power supply and make an adapter or solder the correct cable to it
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Saturday dude. 
JM 