Just bought the car. The 4wheel drive does not engage

Light for 4 wheel drive does not light and 4x4 does not engage

Was running fine, went in store cam back and it wouldn't start. I checked fuel pressure and it's good. Tried starter fluid and it started. What could be the problem?

Warning lights. Check gauge, check battery, break system and check engine are all on. Lights and radio all work. It was rattling before it died

My radio isn't getting power