Okay so after going into maintenance mode (and not click on anything, just turning it off again - stuck on black screen. It had a full battery. With or without microSD card inserted, same response.
Seems like things are deteriorating rapidly. Maintenance mode just kinda resets everything. As long as you don’t execute step 3 it’s a benign process.
Let’s work on getting you back to square one at least.
Hold the power button for 12+ seconds to get everything turned off properly and restart. Hoping this will at least get us back to being able to get the initial injection.
let me know exactly what it does after that…any lights, flashes, logos, noises…anything at all when you hit the power button.