2002 H1 HUMMER NO CRANK NO START

2002 H1 HUMMER We just purchased this a month ago. It was running fine then we pulled it over to the garage and My husband put on a set of piaa driving lights. The only thing he really removed was the negative battery cable. Once he was done he went to start it and it wouldn't crank. Could this be bacuase of the Viper system? Can it disable to starter? The battery has 12 vts from each, on a load test it's 10.9 each. The dome light fuse was blown and we replace that all the others are fine. There is a viper aftermarket system I wasn't sure if it could disable the ignition. The dash lights all come on and dome lights but you turn the key and nothing like the starter is bad but it's not we checked. when you turn the key there's power to the green solenoid wire and the main power feeds have power to the starter. Any ideas? Thanks so much. Is it just a coincidense this happened when installing the lights or does it have something to do with it?? Frustrated. cleaned battery terminals checked all the stupid stuff.