So my laptop makes this high pitched whining when I plug in the charger. It goes for about 10 seconds while at the same time getting quieter until it is completely gone. This happens regardless of whether the battery is in or not. The laptop is about 3-4 years old and has never done this until it started a few days ago. Should I be worried? Or is it harmless. The laptop seems to run just fine, and I don't hear the noise again unless I disconnect the charger and plug it back in again, in which it will then whine for about 10 seconds again.
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