You need to give us some better pictures. I am confused by the ones you have, as I have never seen a ballast like that. Most ballasts have 3 connections. 2 hot, 1 ground. White, Black, and Green. There is a ground spot inside the ballast (where the connection comes from the wall), the green gets screwed to the ballast (make sure this is bare, no paint). Then there is a ground inside the light fixture itself. This is an easy one to miss. It too must be bolted to the inside of the fixture, bare metal no paint.

Does your ballast have a metal case?

On my digital 600s, I have 3 connections coming into the ballast (white, black, and green) and then only 2 connections coming out of the ballast (white and black). It works fine.