Well from your picture post, since i fix graphics cards.
Thoe`s vertical lines can mean one or two, or three things.
None of them are particularly good i`m afraid to say.
The first is one of the memory modules of the card has bad solder contacts on it.
So the whole card may need a re flow to fix the problem.
The second can be due to a bad capacitor on the graphics card its self that needs replacing.
And the third is the most worst of all, the GPU has suffered damage from excess heat, or is getting very hot.
Ie: Cooling fan not working, or heat sink not attached firmly to gpu.
All three can exhibit the same screen corruption with vertical lines.
The first thing to do is strip the card of its cooler.
Perform a whole heating of the card and a re flowing.
Then wiping of the old thermal compound from the Gpu die and the contact plate of the cooler.
And applying new thermal paste and clamping the cooler back on and testing.
If it fails, and still has the vertical bars of color, then the next thing to check or replace are the caps.
Or the one faulty one causing the problem to fix it.