i changed a battary in a kia sportage and replaced it with the proper battary and now it wont start at all, it seems that the engine is not firing at all...it was a routine change. is there a chance that i immobilized the engine somehow by unhooking the power.....????? any thoughts

I've had the exact same problem, go to 4x4wire.com and look at my "please help not starting" thread in the Kia forum.