2005 grand caravan started then stalled 3 seconds later. now will not even try to start

tried to start vehicle 4 times and same result. now wont try to start at all.  all
dash lights are off and when i turn the key on the headlamps come on. key
fob does not work the door locks, door openers, or panic button. this
vehicle had an emission test done on it today where they connected the
obd2 connector to it.(dont know if that matters) drove it across the street to
work and parked it left key in the ignition (off and half pulled out) and 9
hours later these problems occurred.. i know that the battery / spark / fuel
is good as the vehicle started with no issue until it shut down 2-3 seconds
later.  need help to find issue  as i need to work again in the morning.