Was going to return 2 stock, after following instructions I find myself in this situation. Was on Lollipop still flashed bootstack, then return 2 stock and after wiping dalvik cache etc. TWRP ask if i want to install root I tapped do not install. Phone turned off & won't turn back on no matter what I do. I plug it in to my PC and i hear a chime that a device has been connected but don't know what I could possibly do. If anyone could point me in the right direction it will be greatly appreciated.