Won't turn on — guides
Phone that will not power on, iPhone full-storage boot loops, Recovery / DFU and data-safe steps before service.
Phone won't turn on / won't boot: safe steps before a repair shop
Phone won't turn on — charge, force restart, black screen.
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.