Sorry you're here with problems.
If your having a problem with the dash lighting up when it should as well as a no start condition. I'd say start checking the chassis system's grounds. You have a poor connection somewhere , either the battery cable to engine or frame, or a connecting cable between the engine and frame.
Did you have the batteries tested, or just replace them ?
Have you checked for full battery voltage at the ignition switch ?
Do you have a voltage multi-meter?