i dont know anything about power commanders other than what ive read on here but what are your symptoms?,
is it cranking over?
is it firing?/trying to start but not quite.
have you blown a fuse.
re-check what you've done
Make sure the fuel injector connectors are all tight and in the right order. If you do it backward, or you mix them up the bike may not start. Also make sure that you tapped into the right wire for the throttle sensor, and that you have the ground wire connected to the battery.
Does the power commander light up when you turn on the ignition key. Does it respond when you twist the throttle?