Noise coming from Nook HD charger

I've noticed a strange noise coming from my Nook HD charger i.e. the plug part. It almost sounds like gas escaping or water quietly running through a pipe. It's really quite quiet (more noticeable at bedtime), but is it dangerous?

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JanSt / MOD  Sep. 30, 2014 at 20:04

I'd be concerned. It shouldn't buzz.


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