You can press the volume down button and the power on button for 30 seconds to forcibly restart the phone to see if it can be turned on to the desktop; If it doesn't work, please hold down the volume increase button+power button at the same time, and let go when you see the word vivo. Move the cursor with the volume key, and confirm with the power key to see if you can enter the recovery interface. You can enter the "Recovery Interface", select the system repair mode menu, and try to repair the system according to the prompts. If the repair is unsuccessful or still abnormal after the repair, please bring your mobile phone, charger, data cable and relevant purchase vouchers to the customer service center for testing. The address and detailed information of the customer service center can be found in vivo official website APP- Services-My Services-Service Network-Select your province and city.