Hi,I was recently replacing a G.F.I ,but I took it out of another unit .I looked for the breaker box ,searched for location of such in the breaker box ,shut it off,then took it .next breaker in to the unit w/o it and turned off power off ,then replaced it by looking at the back of G.F.I .there is power in the line, but the reset buttons don't click ;nor the light of such won't turn on.what do I do ?