Firstly many thanks to all throughout the thread / forum, for all the help, advice, experiences etc etc. It's really very kind and helpful, great to know you're out there.

I've printed out the instructions you've posted Bill for system re-set and the tests you mention, and added the page in my owners manual, never know when I might need this info.

You mention Bill "special self extractors to re-installing the o/s" if it's not too much trouble i'd love a copy of these files with any brief instructions on how to install the OS.

With regard my KN7000 it's gone in for repair, to my amazement it briefly came to life during one of the desperate on/off button presses I made just before I took it to the engineer.
The moment power is drawn to load any file from the floppy drive the keyboard shuts down.

According to the engineer whom I informed of the above, it points at this stage as a possible fault with the floppy drive, but more likely a power supply problem, but obviously tests are needed to determine the exact problem.

Once again thanks to all

Kind regards

Peter