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nokia N91?

Uploading PC software suite the battery died and now it won't switch back on
alan nokia phone, November 2008
I think they do mention to make sure that the phone has enough power otherwise it will fail.
I know this will not help you now, that this happen.
The only thing I can suggest, to take it into repair shop - like Carphonewarehouse. If its in guarantee period - they will do it for free, if guarantee period is up - it maybe costly and they not always tell you how much it will cost before they take it in.
I was lucky with mine - it was still under guarantee by 1 month when this happen to me.

Sorry this may not be the best answer.

anna, November 2008
link Click here to see other fixes for Nokia.