Have a 2005 jeep liberty that does nothing when you turn the key starter is brand new and not the problem dealership has no answers any ideas?

Take a test light and begin at the starter. Keep working your way back through the circuit until you find power. You'll need a partner to turn the key each time you test a circuit. By the way, do you have a manual trasmission and is there a starter disconnect built into the clutch? There is also a starter lockout on automatic transmission so you cannot start them in gear. Either of these two could be the culprit.