My iPhone 5S wont turn on

Reset the device by pressing and holding the home and power buttons for 15-20 seconds until the white Apple logo appears.

If this does not resolve the issue, plug the device into a wall outlet for at least 20 minutes and then try a reset.

If none of this resolves the issue, take the device to Apple for evaluation.

The first tip helped so much I just saved myself a trip to the apple store. Thank you.