Car won't start: No lights, No cranking, Nothing

Had a similar problem with my car, most likely it is your bulkhead connector on the firewall. Try opening one of the doors and press on the bulkhead connector in various places and watch to see if your dome light comes on. Sometimes those "connections" become loose and you have no power. I tweaked mine around a bit and have not had any problems since. Good luck, probably something simple. Give it a try.