If your AC won't turn on, try these troubleshooting steps:
• Check the thermostat settings and batteries
• Inspect circuit breakers and fuses, reset if tripped
• Ensure the air filter isn't clogged
• Verify that vents aren't blocked
• Check if the condensate drain line is clogged
• Look for ice on the evaporator coil
• Make sure the outdoor unit is free of debris
If these steps don't work, there may be more serious issues like a faulty compressor or electrical problems. In this case, it's best to contact a professional HVAC technician for a thorough diagnosis and repair.