There must have been a surge when the power came back on. Some power taps have a circuit reset button located somewhere on the unit. You'd just need to push it to reset. Others just use the main on/off switch to reset, just cycle it off then on then check if it works...if these dont fix the problem, are you getting power from the outlet the power tap is plugged into? If not, then you may need to reset the main breaker in your home.