I have updated the driver from NVidia, but still get the issues. I've put the RAM back the way it was, but still had a crash. The photos are actually in order.

First one seemed to be a video card issue. I updated the driver. After the second I took the new RAM out, and the third was the next instance after I had updated the driver and took the new RAM out.

Running it as normal (this might sound weird) but with the intention of making it crash, so I can get more 'evidence' to see what it is.

I have read that a PSU that is overloaded will make a system unstable. Hopefully this weekend I can take the PC apart, refit everything and see what it does.

Thanks for the advice so far. Very welcome.