1996 caddy wont start some power

Check the key switch.

I would start checking fuses for power. It could be a battery cable issue or something in the fuse box. The dash lights would not be powered thru the key switch, but the other stuff would be. Provided the key switch is getting power for accessories.

Depends. When you turn the key to start, the only thing that has power is the outside lights and the starter relay. In the on position everything but the starter should have power. So that will have to be sorted out. If some things are dead with the key on, either you have lost power between the battery and the fuse box, or the key switch is faulty.

Could be the neutral safety switch or the starter solenoid.
You could try cranking it in neutral, or check the small wire on the starter solenoid for voltage when the key switch is in the start position.

charge the battery?? or jump the car.. could be a dirty battery connection, not enough power getting to starter

Make sure all cables and connections are clean and tight

Sounds like the starter could be going bad or frozen. But before I did that I would check the battery to see if it has enough power to start the car. Your battery could have enough power to run radio and lights but not have enough cranking power to start the car especially if you are in a cold area. Low temperatures can cause your starter to freez and your battery to not crank the engine.

check the earth wire from the battery, if it is a poor connection the car will not start but you may still get lights etc.

The starter motor could be completely jammed. put the car in gear with the keys not in the ignition and push the car forward until you feel the engine turn over, this may free the starter motor up.

MAKE SURE BATTERY CABLES IN GOOD CONDITION.IF ALL IS GOOD .HAVE STARTER SOLENOID AND STARTER CHECKED.

Troubleshoot the starter. If your battery is good, then you WILL have power...the lights will work, horn, etc, but....if the starter is toast...you need a starter.