I followed this guide and now the screen is black when i power the phone on. I tried checking the lcd (and all the other) connectors sever times but they were always connected and clean. I disconnected the battery several times. The phone is on as it vibrates when i hit toggle the mute switch. i tried restore, home and power button loads of times and even resorted to a DFU restore. absolutely nothing. not parts look damaged as i have closely checked connectors and ribbons etc. please help as i am out of ideas and i am totally gutted.