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my battery went flat some 3 weeks ago and havent been able to reboot my iPad since then. i have used different cables and have tried pressing the home and sleep buttons. all i get is the charging symbol even when it is not connected to the charger an nothing else. please help

Every once in a while when I let one my Apple mobile device die completely and stay dead for a while it takes some time for them to come back. I usually plug it in with a charger I know works and leave for about an hour. Sometimes it comes back to life a little quicker than that but that should be a good gauge to let it sit. Give that a go and see where you end up.