Horizontal lines on laptop

Hicsousi

Commendable
Nov 16, 2016
1
0
1,510
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When i boot up my probook 6550b I see this:

But when i connect it to a monitor, the picture on the monitor is normal but the laptop display stays the same. After maybe 10-15 minutes the laptop display fixes itself. I searched for solutions online, but everyone suggests that the screen is broken, but that is not the case with my laptop.
 
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