Well so much for that. Was running time machine backup and a handbrake job for a few hours, and came to the computer to find the screen complete messed up (shaking, broken lines, etc). Turned it off and restarted. Now I get flickering in the middle of the screen, in the shape of the two windows that were open. NVRAM and SMC resets do nothing. Still happens when i change screen resolution or turn off auto switching graphics. Also happens in safe mode. Does NOT happen on the "black" screens (boot up, shutdown, etc.). The flickering stops when I move the mouse cursor. Guess this is going into the Apple Store and I'll sit around and wait for a replacement (problem is, because of holidays, I can't even get an appointment until Saturday). --- Post Merged, Nov 22, 2016 --- Update: running gfxcardstatus, looks like it only happens when using integrated graphics.