2007 Mustang won't crank

Any advice?

Make sure battery has a full charge and connections all good. Your security system says it is starter motor disable among other components. With testing, you can see if starter motor will crank the engine, but, if security system is involved, even if you crank it, it still won't. If you try that, make sure transmission is in park or neutral and parking brake is set. Make sure vehicle can't move. If security system is the problem, you may need a scanner that can communicate with that system in order to fix. Just my opinion.