Full story as short as possible. A week after buying a refurbish P3S it started blinking R,Y,G. Mailed it to DJI. They charged me $113 to replace the mother board. When I got it back it was still not working. Still blinking R,Y,G. I eventually got my money back and took it to a shop in Northridge. They charged me $45. Said they reset something. AIG? I've forgotten. We tested it in the parking lot with out the propellers. Brought it home and it will not start. Just 4 solid red lights. Drone has not flown in about 5 months. I'm at the end of my rope with this thing. It will be in the trash shortly if someone doesn't have some bright ideas.

Download the manual, your questions should be answered.  

Solid red rear lights indicate a critical error.  Could be a number of things.  Are you seeing any messages?

Hi. We apologize for the inconvenience. Did you try to connect it to your app and see if there's any error message showing? Did you try to update the app?