AC wont turn on- dash control lights flashing

Recently the car ignition was left on overnight. The battery was dead. the car was jumped and started fine. on the dash the rear wiper, the intermitent wiper, the recyl. air, and the A/C button were all flashing. Now the A/C wont turn on. it will only blow hot air. now matter what temp the thermostat is set at it will only blow hot.

by the way its a 1998 dodge caravan with about 100000

Fully recharge the battery, disconnect it for about five minutes, and then reconnect.