video error

I'm not sure why, but I left my computer on idle for the last few hours, and now seemingly out of nowhere, most videos played on my computer have blue vertical lines in a chessboard or rainfall pattern (depending on whether or not the video in question is panning left or not). The severity also...

I'm building a itx build for a friend he is going to be doing some caita work at home and wants a computer which can last. He is on a really tight budget say £600. I was thinking of something like this: Motherboard:Gigabyte AB350N-Gaming WIFI AMD CPU: Ryzen 1600 GPU: My old 7950 (sell it to...