uhm so well, this is for you guys who still searching for the answer. I tried all the ways to fix like change the battery, use the adb command, hit the power button as hard as I can. Then, I plug the cable, in the right of the number 2 shields house of processer, find the CR500 area and hit all of that three-point by metal for seconds. The kindle will light up and show the battery-warn icon. Keep it for a while (I don’t know but I did that), then unplug, press the button and keep it till the kindle start. Goodluck guys.