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Try doing a power cycle. To do this hold the Volume Down button and then the Power key simultaneously for about 15-20 seconds. If this does not work, try holding the Volume Up button instead of the Volume Down button.
Make sure to do this while the phone is not plugged into a power source. It also might take a few tries.
If this continuously fails, the battery should be replaced. There is a guide on this page for that.
这个答案有帮助吗？
Excellent advice worked first time. Thank you saved me sending it away.
Oh I love you
what causes this to happen?
ankitis beat me to it...…………………..I love you also :-) Worked first time with the volume up advice x
Thank you - worked first time for me too :))
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