If your Jeep Cherokee won't start, there are a few possible causes to consider. First, check if the battery is dead or discharged. If so, jump-start the vehicle or replace the battery if necessary. If the battery is fine, inspect the starter motor and related components for any signs of damage or malfunction. Additionally, check the ignition switch, fuel pump, and spark plugs to ensure they are functioning correctly. If troubleshooting these components does not resolve the issue, it is advisable to consult the repair manual or seek professional assistance.