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Having dug around on various web sites I realised that the screen display can be maintained even if the battery is flat, so the fact that it was showing 2 bars was meaningless. I recharged the reader (mains charger) overnight and it started ok next morning. The book I was trying to read still caused a lockup, so I deleted it via the PC, converted it from ePub to LRF format, reloaded it to the reader and it now reads ok.
I think that the original lockup (cpu in a loop or something) caused the screen to freeze, and the battery to be exhausted very quickly, so that there was then no response to either the on/off switch or the reset button.
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