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Won't turn on — guides
Phone will not turn on or is stuck in a boot loop? Start with data-safe checks, including restart, Recovery and DFU, before seeking repair.
Phone won't turn on / won't boot: safe steps before a repair shop
Tell a powered-off phone from a black display, and learn when a force restart is worth trying.
iPhone — restart, Recovery, DFU and Diagnostics
Force restart, Recovery, DFU and Diagnostics — new and older models.
iPhone storage full and stuck on the Apple logo: protect your data first
Full storage, Apple logo or boot loop after an iOS update — data-safe first steps.