The black or the red wire should be hot all the time (the other supplies power to fan). If neither is hot, check fuse/breaker. For a single-pole switch, it doesn't matter which wire goes to which switch terminal. If everything checks out in the switch box, then check voltage at fan (as per firulice), if you have volts, then the motor is probably bad. If you don't have volts, then it's probably a wiring problem (I'd check the neutral first).
You say you wired a green wire to the switch ground, but all I see is a bare ground wire. If you have bare grounds, the green wire may be for power.
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