My iPhone won’t start up!
What to do with an iPhone or iPad that refuses to switch on
There’s not always an obvious reason why your iPhone would fail to turn on (or turn itself off ). But before you panic too much, there’s some good news. The most common cause of an iPhone failing to start is a flat battery – even if you haven’t used it much since you last charged it, or it had plenty of charge left in it just a few minutes ago. Occasionally, batteries spontaneously lose their charge for no reason, so the first step to take is to plug your iPhone into a charger and leave it for a few hours. If it still doesn’t turn on, then you can panic. No, wait… not yet. There is one more thing you can do!
First, reset it. Press and hold the Sleep/wake and Home buttons for at least ten seconds or until you see the Apple logo on screen. If it starts, you’re good to go. If not, you’ll need to try resetting it using iTunes. Connect the iPhone to your Mac with a USB cable and launch iTunes. If the iPhone appears in iTunes’ main window, select it and click Restore. Click Restore again in the dialog box that opens. Now wait while iTunes does its thing. When it’s done, your iPhone will be returned to its factory state, so you’ll need to re-install apps and data. Go through the set-up screens as normal and then choose either Restore from an iCloud Backup or Restore from an iTunes Backup, depending on which you use.
If your iPhone doesn't appear in iTunes, force it into Recovery Mode. To do this, follow the steps for resetting an iPhone using iTunes, but hold down the Home button as you connect the USB cable (which is already plugged into your Mac) to it. When you see the ‘Connect to iTunes’ screen (a cable and the iTunes icon) release the Home
Batteries can lose their last charge for no obvious reason, so the first step is to plug your device in
button. iTunes should launch if it’s not already open and display the message: ‘iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes.’ Restore the iPhone as above.
What else can you do?
If that doesn’t happen, and you still can’t connect the iPhone to iTunes, restart your Mac. When it’s restarted, check the USB connection between Mac and iPhone is secure. If it’s connected through a hub, remove it and connect it directly to your Mac. Disconnect all other USB devices from your Mac, just in case they’re causing a conflict. Try a different Lightning or Dock connector cable if you can. Make sure OS X and iTunes are up to date by running Software Update. If necessary, download and install any updates which appear.
If none of that works, and your iPhone still won’t turn on or connect to iTunes, and you’re sure you’ve given it enough time to charge, it’s time to pay a visit to your local authorised service centre or visit your Apple store’s Genius Bar.