When a device runs out of battery, it may refuse to turn on owing to faults in the charging and/or power systems on your iPhone. As a result, this defect prevents your smartphone from performing its normal functions, such as charging and starting up. In this instance, a hard restart while your smartphone is connected to the charger is a viable option. Check to see if your gadget has a sufficient amount of battery charge to start up. Then, while your iPhone 8 is connected to a power source, repeat the preceding procedures to force it to restart. Check to see if that works.