Good idea about helping others - when I searched for the links again from my revived computer, I couldn’t find them easily. I had to go to my other computer that I had used while fixing the broken one, because… 
Here’s a good overview article with pictures. They reference this website, which has all the gory details. Basically, there is a software mod to disable power to the GPU when it boots - this involves booting linux to change that setting. But, if the computer boots in non-safe mode, it will re-identify the GPU and undo that setting. So, there’s a hardware mod to disable the power supply to it - it’ll be like its unplugged. It’s been working like a charm for 5 months so far. One limitation is that it can’t use the latest OS because it talks to the backlight in a different way that doesn’t work with this mod. But, luckily, I had an older OS installed.
