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Hi my name is Robert...
IF you checked ALL the GFCI'S and they are working then you could have a wiring issue. To start I would get a polarity checker, it will plug into the outlets and tell you if there is a wiring issue such as an open neutral, ground or short. Most places like Home Depot sell them for a few dollars. IF the polarity checker does not light up then I would go to the breaker panel and check for AC voltage out of each breaker. Go to the outlet that is not working closest to the breaker panel and check the connections and then check the other. Make sure you also do not have a GFCI hiding sometimes they will stick one on the outside... Robert