did you check the fuses both under the dash and in the engine bay near the battery? check the relays too (little boxes in the same place as the fuses in the engine bay). Also, check near your driver's side headlight to be sure that all of the electrical connectors are connected. There are 2 there that are a part of the A/C system (at leasat on the Civic). Did you also look to see if the belt is attached. The belt may have broken without you knowing it so the compressor isn't turning. Check these things out and let us know.