my mobile i phone 5 wont turn on

Try a reset: hold down the power and Home buttons until the Apple logo is shown on the screen, then let go. You do not lose any data or settings.

1. Connect to AC adaptor and charge for at least 1 hour.

2. Repeat force restart: press both the home and lock buttons for up to 1 minute, releasing when the Apple logo appears

3. If no response to #2, take it to Apple.