Have A Ruud 10 seer condensor...checked the fuse box..thats about all i know what to check...it just wont come on...what else can i do or check before i need to call someone

Did you check the disconnect close to the outside unit? If you have a multimeter you can check the capacitor. If you don't have a meter look at the capacitor, if it looks swollen then it's more than likely bad. Take it to a heating and air distributor and they can check it before you buy a new one. They are relatively cheap. Also check the condition of your contactor. Also make sure contactor pulls in when the thermostat is calling for a/c. Then check the voltage in and out of the contactor with a volt meter. Replace the contactor if necessary. Let me know what you find and I can give you further guidance if needed.