While the issue looks like the iPhone is “stuck” on the Apple logo screen and nothing is happening, plenty is happening below the surface. Your iPhone is actually starting and restarting over and over again.
This problem is known as the “boot loop”, and it happens when your iPhone tries to start up. An iPhone booting up (turning on) launches a sequence of events. One step of this sequence is displaying the Apple logo screen for only a few seconds before it goes to the home screen.
If that boot-up sequence fails, it reboots on its own and goes back to the Apple logo screen without ever reaching the iPhone home screen.
As annoying as the stuck logo screen can be, it’s not the problem; it’s the indicator of the problem, and now it’s time to know the possible causes of the problem to begin resolving it.
Root problems that could be causing your iPhone to be stuck on the Apple logo include:
Interrupted iOS update
If the Wi-Fi connection is not stable during an iOS update, it can lead to several interruptions of file downloads results in corrupted system files. You’ll know if this is the cause if the logo-stuck issue started when your iPhone tried to reboot after an update and is not successfully turning on all the way through.
Failed Backup Restore
If the problem started after you tried to restore a backup, most likely that backup was corrupted, and it’s behind the stuck Apple logo issue.
Third-party App Interference
On rare occasions, a third-party app can be the reason behind an iPhone boot loop if, before the restart, the app downloaded a large data cache, causing the iPhone memory to reach 0 free bytes. As a result, the required memory space for iOS to start is not available anymore.
Hardware Issue
A failed component that the system tries to communicate with during the boot-up sequence is causing the loop.
iPhone jailbreak gone wrong
Jailbreaking an iPhone requires modifying iOS files outside of Apple’s protection. This is why it’s one of the main reasons behind corrupted iOS files. Note that jailbreaking voids the Apple warranty, which affects the options available to you.