Hello! You can try the following methods, 1. Please long press the power button for 15 seconds to try whether can open oh. 2. Please charge for a while and then press the power button for 15 seconds to try whether it can be turned on (the phone is completely out of power and then charged without any prompt) 3. You can long press the volume key to enter the Recovery Mode, press Volume - select Recovery Mode, press lock screen to enter the Recovery mode, press volume - select wipe data\/factory reset, and then click lock screen key. After the interface is switched to, Select reboot system now to restart the phone. (Doing this will lose all data on the phone, including installed apps, phone books, text messages, etc.) Use this item only when the phone has a serious anomaly and there is no other way to solve it. If you have any questions can come at any time consulting us. Thank you very much for your support to vivo, I wish you a happy life!