Problems with sunfire maybe bypass? or ignition?

Ok we just bought this car for are daughter its a 1998 sunfire..It stayed running until we disconnected the battery now it will start up and die..So where thinkin its sumthin to do with the bypass..anyway of resetting it? where lost on this one ok here is the deal its running started it from the starter sylonoid so could it be the ignition? Please help we just boought this car for her and she just got her liscense and cant drive it...Thanks...