Trailblazer no start no crank
 

My daughters tb started acting up this morning. she drove it to my house and it was fine. went to leave and no start no crank. you turn the key on and all dash lights come on as normal. turn to start and all go out except check engine. its not a low or dead battery, its at 13 volts. auto start wont start it either. ive replaced the starter relay no change, I scanned the computer, only code was an evap and a cam position sensor. neither would keep the truck from turning over. am I looking at a ign switch problem? is there a way to test the ign switch?

forgot to add the specifics. its an 06 with the 4.2 straight six.