Try and see if there is an updated driver for your GPU. I have seen simular when the wrong driver was installed on one of my desktops. It is a long shot and could very well be your GPU is crapping out.
Try and see if there is an updated driver for your GPU. I have seen simular when the wrong driver was installed on one of my desktops. It is a long shot and could very well be your GPU is crapping out.
If you can, see if you can downgrade to Mavericks, their are reports of Yosemite causing some issues like this, but not the on scale that you show - but it can't hurt to try
If you can, see if you can downgrade to Mavericks, their are reports of Yosemite causing some issues like this, but not the on scale that you show - but it can't hurt to try