Screen freezing - virus or hardware problem?

Since a week my macbookpro is experiencing difficulties with the screen.
If you like I can sent you a screenshot taken with my tablet.
In short: when I am using programs like photoshop or capture one the problem occurs faster.
What happens: or the screen freezes, or the screen gets entirely striped.
After he hard reset, sometimes I can continue working, but sometimes nothing comes after the startup sound: Only a blank screen and the ventilators making noise.
Is this a virus, or a hardware problem?
Appreciate your help.
Regards
Dimitri

The hardware test that comes with your system is fairly limited. If it finds something, you can be pretty sure that you've got a hardware issue... but if not, it means nothing. It only means you don't have a problem that it is capable of detecting.
Apple can run more extensive - and more conclusive - diagnostics on your graphics card.

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