MacBook Pro (Retina, 15-inch, Late 2013) shuts down when not attached to Thunderbolt Display Maybe somebody else is having this same issue? I have a MacBook Pro (Retina, 15-inch, Late 2013) running OS X El Capitan. For some reason, anytime I unplug the laptop from the Thunderbolt Display, it will shut down. I need to hit the power button for it to come back to life. It shuts down pretty quickly most of the time, although I've seen it stay alive for 5-10 minutes at the most.

I'm in the System Profiler looking at the battery info and it reports everything is cool. Fully charged, 284 cycles, condition normal. Any guess what might be wrong with this? Is there something to try before I spend money getting the problem diagnosed?
Try resetting the SMC (https://support.apple.com/en-us/HT201295) and the NVRAM (https://support.apple.com/en-us/HT204063)