The screen goes blank while in use
I was getting horizontal lines across the screen, now the screen is white. Seems to be caused by the lid position. I have rebooted it several times.
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Are you saying that depending on what angle the screen is at it can display this behaviour?
If this is the case you may have a loose wire or connection, or even a wire that is wearing.
To remedy this you will need to disassemble the screen and have a look, handily ifixit has a guide for that.
Let me know how you get on.
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