Did you check for another GFI?
Do you mean you have power coming out of the circuit breaker going to a receptacle?
If you have a wiring diagram, check for power at the first receptacle. It could be a bad connection or broken wire. If you don't have a diagram I would start checking the closest receptacle.
If power is leaving the circuit breaker it's stopping somewhere at or before the first receptacle.
Get out your multimeter and start looking.
Did you tighten the screw holdimg the wire in the circuit breaker?