This. If the machine operates properly when plugged into a secondary monitor, then the problem is simply with the main screen. I think you are down to, is it worth it to get the screen fixed or get a new device entirely? Or get a new device, buy a secondary monitor and now you have a new device and basically a desktop.
This will sound insane, but does your (
@FLYguy3911) main screen have a brightness level that got turned all the way down? I technically work in the technology department of a school district, but I'm really the educational side of the department. We have actual technicians, who do not always appreciate my "turn it off and on" approach to fixing most of the issues I come across, but I'm pretty good at troubleshooting basic things. One of which is trying to counteract every way the students make their Chromebooks look broken, the first of which is usually turning down the brightness to 0.