IPhone won't power on or show battery icon after discharge.

My iPhone4 ran out of battery. I plugged as soon as I could after it ran out (within 15 mins) and charged it overnight. It won't power on this morning and does not show the charged battery icon on the screen. The phone is only 4.5 months old and has never been left in a car or extreme heat. I always let the bettery run down to <10% before charging and then charge back to full capacity. I have tried holding down the home key and the sleep/wake buttons individually and together and nothing. Any suggestions?

Thanks for the help. I had tried to connect it to the computer on my own and found out that my version of iTunes must be too old to talk to my iPhone4. I am still running 10.4.11 on my PowerBook G4 which uses an older version of iTunes. I don't use the music feature on my phone to conserve my battery for Apps and other features I really like and leave the music to my Shuffle. Guess I am really lucky it doesn't work as I would hate to loose my photos of my new grandson. I need to find a quick way to send them to backup storage.
When I disconnected after trying the computer and tried your suggestion of holding it until I saw the symbol, it finally worked. Guess I did not hold them both together for long enough. The battery only shows 31% even though it was on wall charger all night. I will use it as is today and charge it overnight again to see if it gets a full charge.

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IPhone won't power on or show battery icon after discharge.

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