Mojave Update – MacBook Pro Won’t Start After Update to Mojave

A similar thing happened to my MacBook Pro - from around the same era.

The only other thing I would suggest is trying a few different wall power outlets and making sure those outlets are working (like with a lamp).

Other than that the unfortunate diagnosis is that your MacBook will most likely have a dead logic board. On the Airs, I am pretty sure most things are directly integrated to the logic board:, RAM, CPU. But the SSD is removable and you could take it out and put in into another Mac to get your data from it, if need be.

Here is a guide on how to take apart that model of Mac Air.

I would suggest your reset your NVRAM, following the procedure from Apple.

https://support.apple.com/en-us/HT204063