I have a Galaxy Express rooted i8730 with 4.1.2. Today there was a message asking PhoneUtil for superSU rights. I allopwed it and then there is no display but the touch, sounds, vibrations are all working as usual.:crying:
I don't get anything but start-up sounds, touch sounds are hearing. All are working fine like I said, but no display. I've connected my mobile using SnapPea and it displays everything on my screen.Do you get a picture when Android is booting or in recovery? You might need to install another ROM and do a restore.