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Take Control of Your iPhone, 2nd Edition by Ted Landau

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Reset, Restore, or Recover

A time may come when your iPhone behaves so badly that even the fixes and preventative tips that I've offered elsewhere fail to resolve the matter. Such serious symptoms include:

  • Frequent and repeated crashes or freezes that are not remedied by restarting.

  • Failure of the iPhone to restart properly. Instead of going to the Home screen, it halts at the Apple logo or restarts itself again (and again, ad infinitum).

  • The Mac OS X single user mode screen appears at startup. It's a black screen with white text, and it is closely related to the screen you can access on a Mac by holding down Command-S at startup.

  • The iPhone screen stays black, failing to respond to any input even after allowing sufficient time for the battery to ...

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