Connecting GPS

When I connecting GPS, Neo-7n, the APM board do not power up after that. Not with lipo or USB or both. Can any one help, thanks.
Best regards Lalle

Is your APM a genuine 3DR product or a clone? This sub forum is for the 3DR products.
Where did you get your Neo-7N from?
Does the APM still work with the GPS disconnected? If not you may have shorted the 5vdc to ground and damaged the APM.