I solved my problem cooking the GPU: Fix your graphics card by COOKING ! (how to) - YouTube
Hi! Playing Counter-Strike, like always I do, the image change to a screen full of verticals black and whites lines. After restart, the screen have horizontals lines with colors. I tried to fix it resinstall the last drivers but didn't work.
My specs are:
Motherboard: Asus P8H77-V
CPU: Intel Core i5-3570 @ 3.40Ghz
Memory: 2 x 4 GB DDR3
Windows: 7 64 bits
You could try a new cable but most likely it is a faulty GPU which will need to be replaced.