Why does the ZTE Majesty turns off on its own?

It's fully charged, and I go to power it on and it will show me my lock screen then shut right off

it's not the battery. mine does it also plus i have no notification sound on my incoming texts. going to try a reset after backing up my contacts & such to my sin card.

Hmm... Open the back cover and inspect the battery if it has a bulge or if it is installed properly.

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