I am looking into purchasing a new to me STS but the factory navigation is not working. nothing is working. no lights nothing. its like no power is going to it. I don't want to get involved in a money pit if this is this case. I don't mind throwing in an aftermarket DVD/CD player in it but don't want to lose any features run by the factory player if there are any. I am not sure. Is this something that can be fixed or something that someone has experienced before? Thanks for any advice in advance!