Easiest thing to do ok. Switch power on and then push down the screen on the laptop so the screen isn’t powered on. Do this within 2 seconds. Let the laptop power up and do its thing. The laptop will power up and reboot, you can’t see this because you can’t see the screen but trust me after 10 minutes lift the screen back up and it works. I believe the issue is to do with being insufficient power to boot up and power up the screen. I could be totally wrong but it worked for me..