One day last week during the middle of a game my screen had a very strong green and red tint and everything went blurry. 2 seconds later everything froze. I restarted the PC (PC#1) and all was fine, and then a few minutes later it did it again. I had a look on Google and the main thing I saw was a loose connection between MoBo and GPU (GPU #1). So I made sure everything was in place, gave everything a quick dust, and tried again. Same thing. I took the card out looked it over, and put it back in, this time I noticed a bright light coming from the center of the GPU. This time the graphics card had caught fire. So I took it out, all okay it wasn't a major fire, nothing else in the PC was damaged. I took the heat shield off the GPU, I could see where it had burnt but couldn't see any obvious reason.
I figured that would be the issue, something had gone wrong in the GPU that was causing these problems and I just needed a new one, something I'd been planning on anyway. I took out the GPU (GPU#2) of an older PC (PC #2) I had been given and chucked that into mine. Everything worked fine.
Then about a week later, it happened again. The screen went green and red and it froze up. Restarting the PC the issue even occurred in the BIOS now. More googling didn't come up with much. So I thought well I'll give it a proper good clean out, tried that no difference. So I thought well I'll take GPU#2 out of PC#1 and put it back in PC#2 and just use that older system. All connected up, turn it on, and pretty much the same thing as PC#1 . There were these green and red dots everywhere (only got a picture of the red ones) and it was all blurry.
So now I'm left scratching my head, I am now left using PC#1 with integrated graphics but have no idea what could be causing this as I've had the exact same issue across 2 systems. However, I don't think it's the monitors as the PC freezes and integrated is working fine.