• One of the fans inside the computer may be loose or need replacing. That's what it was when this happened to me.
  • May be the bearings in your power supply fan. There will be a covered opening on the back of your computer, most often near the top, with a fan inside (you should be able to feel the air-flow). If the noise is coming from inside there, that's most likely your problem.
  • Sounds like you are gonna need a new fan soon. Very user serviceable.
  • Definitely seems to be your fan struggling. Same sort of noise started on my laptop then not long after the fan died. Easily fixed though.

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