Wow - seems more complicated than I thought.
Thanks for all the replies - rather too many to quote.
Ok, points taken - I shall stop my cavalier shutdowns.
It freezes and is not at all responsive so I can't use a terminal; however I did try the shutdown command before shutting down but it didn't work. Also tried the raising elephants..... but no joy.
So what I did was press the Restart button and, guess what? It actually did shut down, light went off but it immediately opened again.
What I can do until I find the answer is to restart into Windows or Pclos and then shutdown from there. A bit roundabout but worth it if hard shutdowns are risky.
I did think of downloading a pae kernel from Pclos and trying to use that in Pardus. That cured the problem in that Pclos. Would that be doable?