why doesn't my iphone 6 turn on past the apple screen?

Iphone 6

Wont do nothing off the charger or usb but on charger only comes on to the apple screen and turns off then keeps repeating.

I tried rebooting.

While connected to the macbook i held down the menu and power button for ten seconds then let go of the power and held down the home getting the phone to restore.

Probably lost all my data.

Unfortunately the phone is still doing the same thing !

Its so frustrating because its my only phone!

What can be happening ? and what can i do ?!