So my early 2013 retina MacBook Pro has been acting up. It randomly crashed and rebooted to the gray screen with the ding and before the login screen it just went black, it was still on as the keyboard back light was glowing but it refused to show anything on the display, normally if the displays LED backlight is off I can barely make out my desktop but this time I couldn't. So I plugged it into my TV via HDMI and both displays magically turned on (the internal lid display and my TV) in both mirror mode and the other mode, discrete GPU ran and I disconnected from the TV. I closed the lid after working a bit and opened it up and it went to my desktop then rebooted its self and did the same thing. Now if I force integrated graphics this doesn't happen and I can open and close the lid as much as I like. I did a PRAM reset early on and it didn't help except reset settings like resolution, and my desktop which I expected. I found an Apple forum discussion with pretty much the same issue but I'd like some to chime in on what the problem is, maybe my discrete GPU is broken? Heres the help article: https://discussions.apple.com/message/23001410 Genius bar will be my next option but id prefer to see if it's something I can fix from home.