nellees

Sorry if this has been posted before, i have searched the how to's but can't find anything.
someone bumped my door mirror, i didnt notice and tried to adjust the mirror with the electrics, it was working fine but i must have tried to move too far to the side as now it only goes up and down not side to side, anyone got diagrams or any ideas as to whats "popped off"...? have had the mirror out but nothing obvious.
Thanks
Paul