2008 Trailblazer has a good, tested battery will not turn over, Will not start, will not shift to neutral to tow. Has no check engine or any other lights on instrument panel the only one that lights is the seat belt light. Windows will not go up or down. Power seats work headlights, horn, turn signals and all other lights work. I cannot even push in the button on the shifter when trying to shift to neutral and yes, I do hold down the brake.