If there's no sound at all your battery could be dead...
he said in the original post that all electrical functions work.. i think its safe to say the problem lies in the starter and/or wiring to it.. maybe the ignition wire has broken off.. maybe the starter solenoid is bad so the starter doesn't engage to the flywheel/flexplate to turn the motor over
2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'