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Does the engine crank over?
This sounds like you have one of the safety switches that is keeping the machine from cranking. You have the parking brake locked, both control levers in the out or neutral position, the PTO is turned off. I would have to start working my way back through those safety switches and identify which one is causing the problem. I would start with the brake switch if you have to check the switch itself, it will be the easiest to get to and you can bypass it to check it for proper operation.