If your iPhone turns completely off and not switch on, without previous damage record- it is possible that it is a software glitch. Follow the instructions below to resolve the problem. * Ensure the mobile phone is sufficiently charged by leaving it in the charger for couple of hours * Hold the sleep/ power button and the home button simultaneously * You will see the apple logo, then let go Your mobile phone should then turn on and start working fine. This issue is commonly found on iPhones. If the instructions above does not resolve the issue and the problem persists, seek help from a mobile phone technician.