Car Will Not Start problems of the 2016 GMC Sierra 1500

Tl-the contact owns a 2016 GMC Sierra 1500. The contacted stated when the key was placed into the ignition and the ingition switch was turned to start the engine the dash board and all lighting system failed,the instrumental was black and the engine failed to start up the contact stated that the failure occurred intermittently. The vehicle was taken to an unknow mechanic and to prime Buick GMC 1845 washington street hanover, MA 02339 phone number (781)-826-8300. The mechanic and the dealer performed a diagnostic that was unable to locate a failure code. The vehicle was not repaire. The manufacturer was not contacted. The approximate failure mileage was 27,600. Li.