Thanks Doc,
Well I was trying to avoid boring you with the details but:
My old PC one day started sounding like it was powering, but remained black. (I 'THINK' I may have left it on a long time, so it got to hot or something... I 'think'.)
Deffo wasn't monitor, and sometimes, the screen would activate, but reboot or die again soon after.
Maybe because I had to power down lots of times, think I screwed something up cos there were some error messages when the screen rarely did activate.
It doesn't come on at all now, but I have accepted there must be a faulty component in my PC.
Anyways.. since then, I am using a borrowed PC, and have my old hard drive a slave, which works great, and I have been able to access all my old files.
However I have to return this other PC soon, and I want to sort my old hard drive to run ok on its own as a master, before I have to give it back.
At the moment when I try to run my old drive as the master (or the lone drive), it gives me the option to run in safe or start windows normally etc, but then whatever I choose, it really quickly flashes up an error message, and then reboots itself.
All I can manage to snatch of the message is something like "A problem has been detected...windows...has been shut down...."
Thanks again for your reply Doc... I think you might have to operate!