Nubia is not plugged in or turned on.

1, Nubian mobile phone battery has been completely exhausted, and it will not be able to start, which is caused by long-term non-charging or battery aging. It is necessary to connect the mobile phone to a suitable power adapter and wait for a period of time to charge the battery enough to start the mobile phone.

2. The power key of Nubian mobile phone is faulty or damaged, which makes the mobile phone unable to start. You can try holding down the power button for a few seconds to see if you can start the phone.