It all went wrong!
I did the update through Software update and restarted. It them locked with the grey screen and progress wheel. Left it for a while, but it just kept going.
Eventually, I took out the battery, pulled the power and restarted without the battery in. Once it was up and running, I went to System/Library/SystemConfguration and took the batterr updater out. [I had to 'Move to Trash' and them moved it from there.]
Restarted, all was fine.
I did the update through Software update and restarted. It them locked with the grey screen and progress wheel. Left it for a while, but it just kept going.
Eventually, I took out the battery, pulled the power and restarted without the battery in. Once it was up and running, I went to System/Library/SystemConfguration and took the batterr updater out. [I had to 'Move to Trash' and them moved it from there.]
Restarted, all was fine.