I didn't reread the first post, no.
I did read the manual and the message I got when I did the keystroke was somewhat unclear. As I said it didn't specifically indicate charging and that led me down the garden path...
All good now though - I hope. It's plugged into the wall and charging and I'm quite happy to use the wall charger henceforth since I have noticed that even with OF, the Windows 7 screensaver produces unpredictable results with Sansa players.
Sincere thanks to all for the good help.
Hopefully I'll get up tomorrow to a fully charged ready-to-go black 8Gb + 8Gb Fuze.