Two more things I would check.
First the ground. If a thorough inspection of that checks out:
Next check the smaller wire to the starter for a loose connection, also check the post it is attached to to make sure it cannot be twisted and is firmly affixed to the solenoid.
If that checks out then have someone put the ignition switch to the start position while checking that small wire at the starter with a circuit tester, it should light up in start mode.
If the wire is tight and it does light up, I'm baffled cause you said that it started with a jump at the starter. If you get lucky you will find no juice at that wire, or a bad connection.
If it shows no power and the connection is good the next place to go is the ignition switch and its circuit protection with the circuit tester.
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