Ok, so we are new in this house and have found numerous dead outlets. It is not usually the entire outlet, meaning both plugs, but usually just one. I know one in particular is a GFCI, but without the TEST/RESET buttons, meaning it is protected downline somewhere. The top plug does not work, but the bottom one did until today when I was trying to plug something else into it. I have searched other outlets that are GFCI and have the RESET button, but only found one in the vicinity of the protected one, in the kitchen and I reset it. The bottom plug started working again, but top one is still dead. I would imagine it is possible that there is something wrong with just the one plug in all of these outlets and not the entire outlet? I mean, there could be a loose wire that needs tightening or maybe the outlet just needs to be replaced, period. I have checked the breakers and there are none tripped and there is no GFCI breaker either. Should I bother with an outlet tester or just cut the power and pull the outlet and check it?
Since 1 outlet worked when the gfci was reset and the other did not look for a light switch that could be controlling the upper outlet this is quite common. If there is no switch close by pull the outlet and see if the connecting tabs on the side of the outlet is/are broke. if broke and a wire goes to the upper section there is a switch some place or a circuit breaker is tripped, yes it could be a bad back stab but I would look for a switch or breaker first because 1/2 of the outlet is working.