I nuked and paved my way from High Sierra to Mojave a few days ago and everything went very smoothly at first. However, this morning my MacBook Pro (Retina, 15-inch, Mid 2015) suddenly refused to start up. I could hear the startup chime and the keyboard seemed to work as the caps lock key showed the green indicator when pressed but the backlighting on the keys didn’t work.
Several attempts to fix the situation (including resetting the SMC and NVRAM multiple times, logging in using Safe Mode etc) failed. I then noticed that the startup screen was visible on the Mac if I held a flashlight to it or, even better, one behind it near the Apple logo (which hasn’t illuminated since this issue has surfaced). I connected my Mac to my TV via a HDMI cable and, once I put my password in, have thankfully been able to use the TV as a screen.
Given the situation with COVID-19, which is particularly bad at the moment where I am, I hesitate to send the Mac in for service. Also, I wonder if the recent OS upgrade has anything to do with this issue as the timing does seem strange. There are multiple reports and articles online about this issue and it seems to be resolved via the SMC/NVRAM reset. Some articles seem to link it to a recent OS upgrade as well.
I have done everything that I could think of to remedy the situation. The only steps I haven’t been able to do are the ones recommending hard powering down the Mac while in Sleep mode (described in the linked posts above) as whenever I attempt this, pressing the power key seems to wake the Mac up first. I also wonder if any software issue could have created this situation. I had installed Affinity Photo and Designer shortly before the issue cropped up in case that is relevant information in troubleshooting this. I’d be super grateful if someone here can be of help. Thanks!