Powers on then shuts off
No such thing as a reset button you can use after you dropped the camera. But the first reaction should be, check where the damage is. If you have any damage on the lens (barrel) you should solve that. If the lens can't move the camera will shut down to prevent any damage to the moving parts of the camera.
Then remove the battery. leave it out for a few moments and then reinsert the battery. Switch it on again.
If it continues to switch off, i'm afraid it really is damaged a lot.
Think what to do, let is repair or buy a new camera. First check what they will charge you for repairs.