Why won't Samsung Galaxy A5 turn on?

My phone wont turn on when i open my case?

I have got a sums unhappy galaxy a 5 I woke up this morning and my phone is only loading up the power on screen then turning off and keeps doing it what should I do

Battery was very low and got switch off.after trying to switch on its on getting on.
Samsung A5 model

Hmm.. What was the last thing that you were doing before it shut off? Maybe it just ran out of battery power. Try charging it first.

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