Dead iPhone 5s after starting once.
Hi to all, a friend gave me a dead iphone 5s, i checked it with iTunes but it didn't show any life signs.
I tried to replace the screen and, without closing it, i connected it to the power, it suddenly started and seemed to work well, so i shutted it down and closed it with all the scews and brackets in places.
Now it won't turn on no matter what, i tried once more to replace the screen, i changed battery and tried different buttons combinations but it returns no life signs at all, I hope someone wouls be able to help me.
Thanks in advance
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