[dufferman]

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.

 

[dufferman]

The problem was the built in microphone. It had accidentally been turned way up and was getting feedback from the speakers.

 

[winbob]

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