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Solved: Laptop has loud "scream" about 20 second into normal startup

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We have a relatively new, computer store built laptop that has just started "screaming" partway into startup. I have to shut it down immediately. There is no sound in safe mode.
I tried air spraying the fans though I don't think it is a mechanical noise.
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The problem was the built in microphone. It had accidentally been turned way up and was getting feedback from the speakers.
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