First question: Did you have power to the bad GFI prior to messing with the electrical?
IF the second GFI is connected to the first one, you may not have the neutral connected properly. Start there and check your wiring. If that checks out then you'll have to start at the bad GFI and work backwards. Test each receptacle until you find a 'live' one. This is assuming you know all the plugs on that circuit. Once you've found that live one, turn off the circuit breaker and check for a loose wire in that box. Remember each circuit has two wires, the white neutral wire, which goes to the silver screw, and the hot, which can be any color other than white or green. That one attaches to the gold screw..your power travels out from the elec panel through the black wire and returns through the white one, completing the circuit. Any break in that system will cause any outlets downstream to stop functioning.....Dennis