Try holding down each of these button combinations for up to 2 minutes or until the phone powers on:
On some phones, some of these combinations may power the phone on into the Bootloader
or Download Mode
screen. If a list of options appears, use the buttons to scroll to REBOOT
or , and press the button to select it.
Note: Make sure you do not select the other options on the screen. Doing so may void your warranty or brick your phone.