Ford Explorer Anti-theft problem

[Allen]

My 2005 Explorer Sport Trac will not start. It appears to be locked out on a continually cycling anti-theft module. No interior lights, constant relay chatter. I had to disconnect the horn to maintain my sanity. Neither key fob made a difference. Disconnected the battery, but that didn't reset it. Did replace the battery but the problem didn't surface for a week. Did notice the needles on the gauges were pulsating below the printed ranges. Any ideas as what to check before I tow the problem to the dealer?

[carriedi]

have you tried to open the door with the key and then turning on the ignition? (bypasses the key fob to turn off the alarm)