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My notebook's screen is shaking every 3 seconds

This problem starts yesterday. Since I turn on the notebook, the screen starts shaking up and down every 3 seconds. Here is the video link:


but now it shakes harder and have dotted lines in the bottom of the screen too.

Model: Dell Inspiron N5520

This is what I tried, and failed to solve the problem:

  • change the screen resolution
  • change the screen refresh rate
  • turn the monitor on and off
  • violence

What hardware/software cause this to happen, and how can I fix this?

Thank you.

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