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i know of lots of electronics with this problem, i've got a few chargers, a set of speakers, and even a remote that does it when the battery is low.
you can either replace or cover up (hot glue works well) the noisy component, or just power them off completely at the wall.
i use one of those automatic power strips so when my PC goes off, the speakers and monitor get power cut completely - could help you out too.
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