Check for physical damage.
First, check whether the iPhone has physical damage, such as bending or water ingress.
Use the original data cable to charge.
Secondly, charge the iPhone with the original data cable and charger to check whether the iPhone responds. If the battery is low, it may not start.
Forced restart
The third step is to force the iPhone to restart.
Go to Apple's official or authorized after-sales service.
If there is still no response after the above operation or it can't be turned on normally, it is recommended to go to the local Apple official or authorize after-sales treatment.
Go to the mobile phone for after-sales inspection and maintenance.
If the above methods cannot be forced to start, it is recommended to go to a professional mobile phone after-sales inspection and maintenance.