I have been replacing outlets for looks and just did the bathroom. I changed GFI there to and had no power to any on that breaker, I changed the breaker and still no power. I tested power coming from breakers and have 120 v. Please someone help?

Connect in coming power to the "Line" screws. Press reset and test buttons. If GFI outlet does not trip on test or rest set, you may have a defective outlet.