Yes "I'm bach" as Arnie would say having got the PC back from our friendly expert. However, it was not without its problems as it continued to close down.
I thought that the same problem - overheating - still existed.
But we have had a little program installed that shows the temperature and that indicated everything was OK. Christine said it must be a software problem with a box ticked to close it down as my monitoring showed it was closing down at a regular intervals after the Screensaver came on. What do women know!! I thought it was the same hardware problem - fool that I am. Further investigation showed what I thought was wrong as I tracked down the problem and changed the setting and everything is all go again.
So she was right. Ahhhhhhhh!!!!
So she was right. Ahhhhhhhh!!!!