The Mac duly did shut down. But when I turned it on again (connected to a power supply) I had no display, even though I could hear the hard drive doing its bit. Hmm, I thought, OK, this could be I'd so exhausted the battery it needs to recover first.
I went out for a few hours, leaving it to charge, and on my return the situation was no better. On another machine, I googled and found this - http://support.apple.com/kb/ts2377
Fortunately I am not too far from an Apple Store, so I was able to book a Genius Bar appointment the same evening. They confirmed this was the issue, and three days later I went to collect my Mac. And very fortunate it was that the cost was met by NVIDIA.
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