OK, let me make sure I understand what's going on. First, a few notes. The outside unit does not have any connection to air blowing or not inside, it unit just receives the coolant, removes heat from it, and sends it to the air handler in the attic. The air handler in the attic has the fan which circulates air in your house-- it passes the air over over pipes filled with coolant (vast oversimplification) chill the air. The "fan" on the compressor outside just pulls outside air through the outside unit only-- it doesn't do anything to inside air.
OK, troubleshooting steps.
If you turn the a/c as low as it will go and leave the fan on auto, what happens on both the outside unit and the inside unit? You may need to leave it there for up to five minutes before anything happens due to built in delays. If the outside unit fan comes on, that means the compressor has power and is receiving the cool signal correctly. If not, it doesn't matter what the inside unit is doing, and you probably have a power problem on the compressor or a bad thermostat (or control wiring). Depending on how the wiring is set up, you might also have a bad sensor as I mentioned in my first post, but that's a tricky one to diagnose w/o a multimeter.
Next step, if the compressor outside (fan) turns on but the air handler in the attic isn't blowing at all, leave the thermostat set to max cool and turn the fan to "ON". This will circulate air no matter what the temp. If no air still blows, there's probably a power problem to the air circulator.
If air blows but it never gets cool, there's a problem in your coolant system and you'll definitely need a HVAC tech to resolve. I'm still thinking there's an extra breaker somewhere that's tripped. I'd go up in the attic and see if you can find one. Take a look at your overflow pan too while you're up there to make sure it's not full. If your condensation line is clogged, that can lead to an overflow which then leads to a shutdown.
Matt