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So my laptop adapter has had on and off humming noise from the adapter for the past year. It was random. Now its suddenly beeping + huming, but only when the laptop is on. If its off, then it doesnt make any noise. I should also note i live in Canada (so 120V) but I'm currently out of the country and in a country with 220V. The adapter is rated for it.
 

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Beeping?? I've never heard of a laptop adapter beeping before.

It's probably a protection circuit or something. I would imagine they would only design it to beep in emergency situations.

Are you able to unscrew the adapter and take a look inside to see if any capacitors are swollen or anything? Depending on how old the adapter is, it might be worth it to just buy a new one as soon as you can, so as to prevent anything from happening to your laptop.
 
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