No Built-In Display, but external video works
My Late-2012 13” Macbook Pro has no Built-in display, but an external monitor works. As far as I can see, everything else works fine. Trackpad, Keyboard, etc.
I thought it might be the I/O board. I replaced that, but still no joy.
I am currently running High Sierra, and am installing Mojave as I write this.
I’ve tried SMC reset, zapping PRAM.
There doesn’t seem to be a lot of info online on how to troubleshoot further.
Does anyone have suggestions?