My problem. My Droid 4 went dead after I ran down the battery (approximately 2 years old). I plugged it into my car charger but I got a black screen and a green light at the top left corner. I could not even power down so I tried to remove the battery but the connector broke as I removed the decal over the battery.
My solution was to buy a new OEM battery and install it. After I installed the battery I connected it to my home charger. I tried to power up and got the Motorola screen and then all I got was a battery charging screen that went from zero to 5%. The screen went dark and after a few minutes I checked again and it showed 100%. I powered on again without a charger connected and got nothing. I reconnected it to my charger and even tried a soft reboot by holding down the top power on button and the down volume key at the same time for 5 seconds and nothing changed.
Next, I removed the battery again and removed my SIM card from the back. I reinstalled the battery and tried to charge it. The charging screen had a question mark now and was not showing a % of charge. I left it for about 10 minutes and returned to see the same screen.
Next I added my SIM card back and powered it back on WITH my phone connected to the home charger. I tried to power back on normally but I got the Motorola screen only again. I did a soft reboot again by holding down the top power on button and the down volume key at the same time for 5 seconds. This time it booted up like normal and when through the whole start up process. I had to leave the phone on the charger until I got a full charge but it was working again. What a relief to be able to remove all my pictures and data from my phone. The Moto Migrate worked perfect to move my pics an data to my NEW Droid Turbo.