I'm not sure if I'm repeating AnaMusic but to perform a
"Force Restore" to do this follow this:
Hold the home button and sleep/wake button until your iPad switches off
Then you will notice it turns back on, DO NOT LET GO until you see the "Plug into iTunes logo" then if you already have a backup of your device you can restore to that and hopefully your battery
I see you own a 1st Generation iPad, if you didn't know the iPad has only an X amount of charges before the battery is un operational and you must purchase a iPad battery (which you can do at Apple)
That may be your problem.