Outside Ceiling Fan Problems: Light But No Fan
There are a couple of things you can try to fix it before thinking about getting a new fan:

All the fans I've seen will make a slight humming noise when they're turned on, whether they're moving or not: if you don't hear that noise, you may not be getting power to the fan.  Turn off the circuit at the service panel, take down the fan from the mount on the ceiling and check all the connections.  Once everything is checked out, remount the fan, turn the circuit on and try again.

Second, does the fan turn easily if you move it by hand?  If it doesn't turn easily, then something is wrong with the mechanics and the motor might burn out trying to turn the fan.  Try spinning it a few times to free up whatever might be sticking; if that doesn't help, then I think it's time for a new fan.