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Question: TZ5 Panasonic battery change killed it??

hi there, I bought my TZ5 twelve months ago and it has been great until the other day. I was using it fine but the battery was running low, so I turned it off and replaced the battery. Now, the camera now does not work at all - no power. I have tried 3 batteries, so I assume it is a camera problem.. any thoughts on how to fix..? would a firmware upgrade help..? thanks in advance