I'm trying to connect my white macbook to a samsun 40'' LED tv with mini-dvi > HDMI. My tv doesn't display properly even if i tried using the highest resolution. The top part (ie. file,edit,etc) is way off the tv screen. I tried lower the resolution down but it's not working. Then i un-click the over scan and it leaves black edges on all four corner. Anyone how to set it so my TV display proerply?