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Inside unit is running but the outside unit is not, what's up?

Tripped A/C breaker: Check this first. Find the breaker for the air conditioner. Turn it completely
"off" even if it appears to be "off", then turn it back on again. If it trips again, leave it alone and call your contractor.

Thermostat wiring broken: Check the thermostat wires by the outside unit. This is the small cable
with small wires going into the outside unit. Many times I have seen this cable broken or cut by
lawn mowers or kids playing, or even by the dog.

And, don't forget! Dirt is the biggest enemy of your air conditioner! Giving your air conditioning system an efficient, high MERV rating air filter is the best thing you can do for your air conditioner. A good air filter will extend the life of your air conditioner because the important parts, like the blower assembly, the cooling coil, and other inner parts will stay cleaner, operate more efficiently and last longer.

And, as a side benefit of having a good air filter, your family and you will enjoy breathing much healthier indoor air. Air that will be free of dust mites, mold, mildew, dust, pet dander, etc. etc.