iPhone stuck at Apple logo
Hold Power+Home button for ten seconds.
When it turns off, hold the volume UP key and turn your iOS device back on. It may take a while longer to boot than usual. I don't know the technical details, but it has worked for many people.
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iPhone stuck at Apple logo
iPod stuck at Apple logo
iPad stuck at Apple logo
iPhone won't go past Apple logo
iPod won't go past Apple logo
iPad won't go past Apple logo
iPhone won't boot
iPod won't boot
iPad won't boot
