Source : Free On-Line Dictionary of Computing

120 reset
     
         /wuhn-twen'tee ree'set/ (After 120 volts, US mains
        voltage) To cycle power on a computer in order to reset or
        unjam it.
     
        Compare {Big Red Switch}, {power cycle}.
     
        [{Jargon File}]
     
        (1994-11-23)