Chosen Solution
So a couple of months ago I was greeted with some serious artefacting and small red lines all over the screen followed by “your computer restarted because of an error” only thing is it didn’t restart and hasn’t since, the machine won’t even boot into safe/recovery mode. Ive tried reseting the Pram and SMC but that also doesn’t work. Internet recovery doesn’t seem to work either. Sorry for how vague this sounds! It’s a late 2013 model 15’ MacBook pro retina.
Lets see if the system is even working. Restart your system this time press and hold the T key (Target Disk Mode) does the screen show the Thunderbolt Icon? If it does we then know the dedicated GPU has failed. If it doesn’t then the logic board has a deeper issue. Update (11/05/2018) @swsh_wohl - Well the good news is you can force your system to work by disabling the dedicated GPU which might be enough for you to limp by until you can to an Apple Store to see if get a new logic board under this extended warrant program MacBook Pro Repair Extension Program for Video Issues. You’ll likely need to push a little otherwise you’ll need to get a new logic board following this guide MacBook Pro 15" Retina Display Late 2013 Logic Board Replacement The possible boards are listed in the guide. To disable the dedicated GPU you can disable the driver, here’s the steps: How to disable failed discrete-GPU (NVIDIA GeForce GT 650M) The last option but risky! Is to use a heat gun and reheat the GPU. This might work its also possible it will fail again. Here’s a bit more: Apple admits to MacBook Pro GPU design flaw
