Your MacBook might be having trouble powering on because of one of your peripherals. Method 1: Unplug all attached peripherals Remove all the peripherals that are connected to your Mac, including the USB, printer, Mini display cable, and so on. But I also get the problem with the battery disconnected. The solutions we often take when our MacBook Pro displays a black screen are listed below. After fiddling with it, it now says it is "Normal". One odd thing: the battery had been giving a warning indicating need for service/replacement. I did manage to do an extended hardware check once when I had the display working, but it gave no hints of any problems. I reinstalled the latest compatible OS (10.13.6), but the issue persists. I've tried disconnecting the battery, removing the solid state drive (and booting off an external drive), and other standard trouble-shooting tips, but to no avail. Occasionally when trying to reset SMC and/or PRAM, I can get the display to work for a few minutes, but then it goes black again. In addition, it does not recognize any external monitors. Using Screen Sharing, I get a display that is almost square, like one would get with a headless Mac mini, rather than a display window proportional to 2880 x 1800. I have a similar issue with my wife's 2012 17" Retina display.
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