Huawei ALE-L21 - 3.22 My phone can stand by normally, but the screen cannot be turned on. What can I do?

HUAWEI ALE-L21/L02/L23 Smartphone FAQs (Applicable Outside China)
3 Others
Issue 01 (2015-03-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
67
3.21 How do I check the available storage in my phone
storage and microSD card?
Go to Settings and touch Storage. Touch Phone storage to check the total and available
space in the phone storage. Touch SD card to check the total and available space in your
microSD card.
3.22 My phone can stand by normally, but the screen
cannot be turned on. What can I do?
Press and hold the power button (for less than 30s) until your phone vibrates or displays a low
battery level icon. If you press and hold the power button for more than 30s and your phone
has no response, connect your phone to a charger and try again.