iPhone restored and Wifi antenna replaced wont turn on

I fixed the wifi antenna(although the actual problem was the emi shield) on my friends iphone which was pretty easy so I reassembled the iPhone then plugged it into my wall charger. It was restored so I went through the normal steps of selecting location time and everything then it said connect to iTunes instead of letting me do it via wifi. So I unplugged the iPhone and the phone turned off. I plugged it into my laptop and the apple logo came up..and went right back off, and a few hours layers it is still turning itself on and off. I've tried everything Incouding the dfu mode steps but I'm having no luck. Help would be greatly appreciated