Source : Free On-Line Dictionary of Computing

blinkenlights
     
        /blink'*n-li:tz/ Front-panel diagnostic lights on a computer,
        especially a {dinosaur}.  Derives from the last word of the
        famous blackletter-Gothic sign in mangled pseudo-German that
        once graced about half the computer rooms in the
        English-speaking world.  One version ran in its entirety as
        follows:
     
        		ACHTUNG!  ALLES LOOKENSPEEPERS!
     
          Das computermachine ist nicht fuer gefingerpoken und
          mittengrabben.  Ist easy schnappen der springenwerk,
          blowenfusen und poppencorken mit spitzensparken.  Ist nicht
          fuer gewerken bei das dumpkopfen.  Das rubbernecken
          sichtseeren keepen das cotten-pickenen hans in das pockets
          muss; relaxen und watchen das blinkenlichten.
     
        This silliness dates back at least as far as 1959 at Stanford
        University and had already gone international by the early
        1960s, when it was reported at London University's ATLAS
        computing site.  There are several variants of it in
        circulation, some of which actually do end with the word
        "blinkenlights".
     
        In an amusing example of turnabout-is-fair-play, German
        hackers have developed their own versions of the blinkenlights
        poster in fractured English, one of which is reproduced here:
     
                                 ATTENTION
     
          This room is fullfilled mit special electronische
          equippment.  Fingergrabbing and pressing the cnoeppkes from
          the computers is allowed for die experts only!  So all the
          "lefthanders" stay away and do not disturben the
          brainstorming von here working intelligencies.  Otherwise
          you will be out thrown and kicked anderswhere!  Also: please
          keep still and only watchen astaunished the blinkenlights.
     
        See also {geef}.
     
        [{Jargon File}]