The answer to 'my ductwork won't turn on' is that there could be several common causes, such as a tripped circuit breaker, a faulty thermostat, or a problem with the ductwork itself. The symptoms you may notice include no air flow from the vents, the system not responding to the thermostat, or strange noises coming from the ductwork.
If the issue is a tripped circuit breaker, you can try resetting it. If the thermostat is the problem, you may need to replace the batteries or recalibrate it. However, if the issue is with the ductwork itself, such as a blockage or damage, it's best to call a professional HVAC technician to diagnose and repair the problem. Attempting to fix complex ductwork issues yourself could lead to further damage or safety hazards.