a sitting box(i guess) came out and i just put [ok],and after that the screen on the tv turned only the background of the laptop.u cant see no desktop icons or the start Button or the internet window that was opened(so i couldn't watch the movie) then i unplugged the HDMI and did the steps back again but that sitting box didn't come back out again and the tv screen stayed only as the background of the laptop 
please tell me how i can put it back as mirrored sitting...
tell me where to go to give u OS/graphics manufacturer .thank u
please tell me how i can put it back as mirrored sitting...tell me where to go to give u OS/graphics manufacturer .thank u