Yes/No Diagnostics
Near your breaker panel if you have a set of generator switches, be sure they are all set in the same position ("Line"). Now at the breaker panel(s) itself push each breaker's handle (except the main breaker), one by one, first VERY forcefully Off (hear any click?) and then after a second or two push it firmly to On. Did any breaker seem to not stay firmly On then (or seem to make a buzz or hum noise for a moment)?