Had gps sit for a week now no gps no lights on gps

set up new pixhawk 2 with 2 here gps. worked on bench only one gps had lights on. during set up i had a bad esc. it set on bench for a week after putting on new esc when i started it had no lights on gps. i switched gps units and still no lights. if i hook up old gps with cable that is supplied with the safety switch the lights come on that gps.
thanks for any help