iPod Problems
The iPhone is a great iPod, but even here, things can go wrong.
Can't hear anything. Are the earbuds plugged in? They automatically cut the sound coming from the iPhone's built-in speaker.
Is the volume up? Press the Up volume key on the side of the phone. Also make sure that the music is, in fact, supposed to be playing (and isn't on Pause).
Can't sync music or video files to the iPhone. They may be in a format the iPhone doesn't understand, like WMA, MPEG-1, MPEG-2, or Audible Format 1.
Convert them first to something the iPhone does understand, like AAC, Apple Lossless, MP3, WAV, Audible Formats 2, 3, or 4, AIFF (these are all audio formats), and H.264 or MPEG-4 (video formats).
Something's not playing or syncing right. It's technically possible for some corrupted or incompatible music, photo, or video file to jam up the entire syncing or playback process. In iTunes, experiment with playlists and videos, turning off checkboxes until you figure out which one is causing the problem.
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