The Death of My GPU? Why does my computer screen have lines?

My monitor is acting possessed. Why does my computer screen have lines running horizontally across my work? Is this a driver issue that can be fixed with a download, or am I looking at a $400 repair bill for a new panel? I need diagnostic help before I throw the whole tower away.
 
Try swapping the HDMI or DisplayPort cable first because a bad connection causes artifacts all the time and it is the cheapest fix.
 
Boot into your BIOS and check if the lines stay there because if they do then it is definitely a hardware problem and not a driver glitch.
 
Did you drop it or hit the screen because horizontal lines usually mean the ribbon cable inside the panel is loose and failing.
 
Same thing happened to me last month and I had to return the whole card after spending three days troubleshooting drivers for nothing.
 
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