Before you do something else, make sure that your device have enough battery to be ON. I suggest that you plug in the charger and try to turn it ON after a couple of minutes (10 - 15 minutes). If you still can't turn it ON, try to reset it. This will wipe all data from it, but it may fix the problem. To do this, press and hold the Sleep / Wake button together with the Home button for at least 10 seconds. If you still encounter problems with your device, visit the following support website for additional information.