Welcome celisary. There may be several things affecting the operation of your unit. Most of which will require some knowledge in the location and function of the components of the system, along with a volt/ohm meter. For now, you can check the circuit breaker that runs the A/C unit and check the disconnect outside by the A/C unit to make sure there is power to the unit. If that doesn't fix the problem, you will have to break out the volt/ohm meter and check some system components. Post back if this is something you would like to move forward on.