HOISTMAN PUSHED BUTTON TO SEND MANCAGE TO SHAFT BOTTOM. WHEN THERE WAS A POWER BUMP, THE HOIST STOPPED. THE HOISTMAN RESET THE SURFACE BREAKER THAT HAD TRIPPED. WHEN HE TRIED TO RESET THE HOIST, IT WOULD NOT. THERE WAS A COMPONET FAILURE, ELECTRICAL SUPERINTENDENT WAS CALLED OUT