Makarios, I've posted several times in this thread on this subject---prior to being made aware of the proper thread for this subject... I'm reluctant to repeat! :-)
Mine did the same thing. Check the lock up by the volume. Mine was on which I did not realize and once I turned it back off to where there is no red showing by the button, the screen the "Auto Rotate Screen" became lighted in the Screen Section under Settings. Hope that solves your problem.