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One of my laptops (a Lenovo Yoga convertible) buzzes almost constantly, especially when plugged in. It's not really like a coil whine either. No idea what causes it. It has buzzed since I bought it, almost 2 years ago now. As the laptop works well otherwise and has no other defects, I didn't bother to replace it. I've never heard any of my other electronics make a sound like that. My other laptop has a slight coil whine under heavier load, but that's a very different sound, and only rarely heard.
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