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When it acts up try moving the henged top back and forth. This can tell you if it's cable or cable conector.
See if you can get it to do the same thing conected to an external monitor. This will tell you if it's LCD or Motherboard display hardware.
When it acts up, will it enter setup and if it does will the screen continue it's crazy habit. If it doesn't this tells you it might be the driver for the LCD.
Just thoughts
Bob
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