I have had this happen to me once a couple of years ago on a 9 months old MacbookPro 13" Retina 2013 model. It simply refused to turn on properly. Having had experience with computer hardware and it’s almost magical ability to self-revive, I wasn’t too concerned, so I did what I could do, and reset the SMC. My approach paid off, and half an hour later everything was running as usual. Try it, should it ever happen again, before driving 50 minutes to the nearest Apple certified shop.