I've just gone back to a friend's Windows 7 machine to make sure it still works under W7 and....it doesn't! I rechecked my cable with his e-reader on his machine and that's working ok, so at least I have some logical answer to this now, in that it must be the e-reader itself. The only odd thing was that it managed to develop the fault when my PC was away being upgraded to Windows 10, which was just a coincidence I guess, and led me to assume it was Windows 10 problem rather than the Kobo itself.
I'm guessing something on the micro-usb port on the Kobo has failed but not sure exactly which bit. Doesn't really matter.
I'm going to see if I can figure out how to connect it via wifi to Calibre (so may be back on the forum soon!)
Many thanks to all those that contributed, much appreciated.
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