yes very true, the camera /sensor/ mic/ head speaker, ribbon cable are to blame for this, my suggestion would be restore without the screen, via iTunes then, after iTunes has finished turn off device, fit without that ribbon see if that works, if yes you know its a faulty camera ribbon etc... you can fit the one to the new screen, just remember to use the old head speaker/phone as well, i had an incompatibility issue so used my old, remember to fit it well as the sound will be terrible otherwise! thanks for your suggestions, prevented another phone going to landfill.. thank you!