1. The display is faulty.
2. There is a problem with the charging data cable
3, the system is not upgraded, the system is unstable.
4. There's something wrong with the phone.
5. The installed software conflicts with the system.
6, the tail strip cable is broken or the battery is broken, can not be powered on.
7. There is a conflict between the downloaded third-party software and the system, it is recommended to double clear.