Is the anti theft light flashing on the dash? Generally when it is a pats problem the light flashes. Do you have the original key with the transponder in it, or is it just a blank key that was cut for the ignition?
It could be pats related, it could be ignition switch related, you may have a bad fuse or relay.
When you put the key in the run position do you get any lights on the dash as all?
If you get no lights on the dash in the run position, then it is likely a fuse, or the ignition switch. You could also have lost 12v constant to the pcm. Does the fuel pump run in the tank when key is turned?