When I use my computer my monitor just turn black nd it say not optimize resolution, nd it happens very often? I have a Radeon HD6850 nd Samsung sync master712n. Nd I will have to plug my computer to a HDTV nd plug in my Samsung at the same time to fix it. It is very annoying, sometimes it happens just from rebooting. Nd sometime happens when I launch a game. Psst im using window 7 ultimate 64 bit. So can you expert help me plz!!!