99 Gran Prix 3100 series electrical problems

hey I am having electrical problems, I was wondering if anybody could help me out..... With the ignition switch on I have no lights no horn, nothing but I can start the car with the gas pushed in and I have lights, let off the gas and it dies nothing, again. No lights, no horn. Does anybody know what the problem might be? Help PLEASE!!!!!!!

Have you checked the battery connections for corrosion? It also sounds like it could be an ignition switch problem.