Have you plugged another appliance or tool like a mains powered drill into the same power socket to see if there is power there?
There is also the possibility although a small one that the limit switches have been damaged or the direction switch .
If the power light is not lighting up you either have no power , lamp is blown , the fuse is blown or not making contact inside the holder so i would look at that first by checking continuity between the mains plug active (hot) pin and the connector that the power lamp connects to the active (hot) line , if your buzzer sounds when you check this it means the lamp is dead but if it does not sound check either side of the fuse as i have seen fuse holders do some strange things !
Then check the neutral line the same way but leave out the fuse check as it is on the live side only but do check the neutral side of the lamp for continuity as a broken circuit here will stop the lamp lighting also .