[villagetinker]

OK, was the wire that was accidently cut fixed? If not this was probably the "feed" wire and that is why other lights are not working. If this was "fixed" and the lights downstream from this "fix" are not working there maybe a problem with the polarity. Let me explain: If you are using LED lights, these are typically on a DC (Direct Current) system, if the wires are swapped they typically do not work. The wiring typically has ribbing on one of the conductors, look where the wires were fixed, and see if the ribbed wire goes to the ribbed wire, if not this is probably your problem.
Hope this helps.