Scrambled web video, Yosemite Zone
Apologies if this has been asked and answered (fingers crossed huh!) but I've searched and can't find anything relating to just this.
By and large, graphics work completely fine for me, I have full resolution and its generally clear except for a couple of things: on YouTube - or any other web-based video website, the video comes out scrambled with loads of black lines. Video playing on VLC, however, works completely fine. Also the TonyMac website is really difficult to read as I get random red and yellow bars that move around, and the first couple of lines of text on each forum post are really thick, so characters lose their shape. Finally, some previews in Finder have that strange coloration with bits of red and purple - but not all of them.
I'm running a self-built PC with an AMD Athlon II X4 620 processor, Gigabyte MA770T-UD3P mobo, and an Asus Nvidia GT-710 graphics card (had the same problem on a GT-210 which I had in before). Booting with nvda_drv=1 GraphicsEnabler=No (doesn't boot when this is yes) npci=0x2000.