Bob, mine showed every sign it was PATS, that was the problem. Blinking Anti-Theft, etc...
The dealership replaced my PATS stuff(sorry, i don't actually know what all is involved), got me new keys, and ended up replacing my whole PCM... and the truck still wouldn't do anything.
Then, they ended up replacing the MAF, and ta-da, it worked.
They had the truck almost 2 weeks.