Yesterday, I went to open my 2015 rMBP but when I did it did not wake up. I tried pressing the power button etc and I had no picture or sound but the unit itself was warm. I googled what could be the issue and went through a few procedures that I found one being forcing the unit to power off. Then I powered it back on and heard the normal startup tones so thought it was ok however no display. Tried a few other things as per what I had found on google including holding SHIFT CTRL OPTION and the POWER button but nothing helped. Spoke to Apple support and nothing helped there so booked an appointment for tomorrow but this morning after leaving the unit disconnected from the power I went to turn it on and the flat batt sign was displayed so I plugged it in and after a few minutes of charge it has come back on as if nothing has happened. So really my question is what the hell happened lol. Should I still go to Apple tomorrow to get them to check it out. Are there any tools I can use to do some checks now etc?? I checked the activity monitor and its showing Kernal.tasks art the top of the list, is this bad?? Any advice appreciated.