problems with my screen being distorted?

ezio160324

Estimable
Apr 9, 2014
1
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4,510
My laptop screen is all distorted and tends to go blank. It's fine on an external monitor, and it's still warrantied, but I just wanna know what's wrong. I get purple and green fuzzy lines and as I said goes blank every now and again. If I pinch the bottom right of the screen, it looks fine. Does this mean loose cable? How do I fix it?