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The humming or buzzing is most likely your contactor where your main power attaches at the unit. As for the compressor and fan not running, it could be the cooling contactor inside the unit or the capacitor. If the capacitor is one of the round or oval metal type, look for any deformity in the housing. Normally they will have some sort of bulge in them when they go bad. BE CAREFUL when you install the new capacitor. I saw a condensing unit with a short cause one to explode once. When you install the new capacitor, make sure you have the power off and the thermostat turned to off. Once installed, turn the power on and then have someone turn the thermostat to cool and if necessary turn it down to create a call for cooling. Stand back from the unit and watch to see what happens. If it starts running, great, problem solved. BTW, most outdoor units have a time delay built in as do most modern thermostats so if the outdoor unit doesn't kick in right away don't be alarmed it could take 30 to 90 seconds before it does.
Something you checked was power. Did you physically close the contacts on the contactor? That buzzing could mean the contacts didn't fully close and you weren't getting power to the fan and compressor. Take an insulated screwdriver and in the center of the contactor you should see a small bar with a spring, press that bar in and it will close the contacts. Let it go and it will open them. Since the indoor fan was running that tells me the thermostat is calling for cooling but it's possible your cooling contactor in the outdoor unit did not close. Visually inspect the capacitor and try closing the contacts manually with a good insulated screwdriver before you go get parts. Please be careful! You're welcome to drop me an email through pelican if you have any more questions. I'll be on the road today but will be checking messages.
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