If everything quit working all at once then I really wouldn't expect it to be the broken switch mounts.
You never mentioned if the light in the dispenser area still works or not, (maybe already has been burnt out for some time so not noticed).
Looking at the owners manual it looks like your dispenser might have a lock control - that would be the first thing to check just to be sure it didn't get switched. Also if the freezer light/door switch is bad it would think door is opened so nothing in the dispenser would work. Another common area that would cause everything to quit at once would be a broken wire at the door hinge that runs power to the dispenser controls.