Weird squares on screen during video benchmark

[g_emanuel]

Hello,

I used today the benchmark software for the first time, and during the tests my screen filled with the colored squares as in the attached photo. Before that it happened with 1-2 square in chrome. I dont know if its something normal because of the benchmark or its something wrong with the video card. Its a GTX 770, i got it yesterday ( used ).

Any idea would be highly appreciated

Thanks!

[David (PassMark)]

Might be bad video memory causing display corruption.