Next time when you start the AC, use a wood stick push the outside fan to see if that start the fan. also, can you hear if the compresser is running. If nothing starts, then you need to open the condenser panel and check other things. If you are not familiar with AC system at all, better call an AC tech for help. (also need to check your electrical box breaker, outside condenser power supply, water safety switch, etc..lots of things can go wrong.)