I have ph317-52. Problem is my keyboard backlit goes off (after couple of seconds of not being used ) while connected to power like its running on battery. This happened after windows 10 reinstall. The backlit no longer stays active for unlimited time while connected to power. I didn't have problem before I reinstalled the windows. All drivers from acer website are installed. I also noticed that power connecting sound( the beep) is gone too. Maybe the 2 problems are connected?!