hi guys! i just got a new tv (an LG) and im trying to hook up my pc to it, i have them both connected but the tv is reading "no signal." now i tried hooking it up to my macbook pro and it works perfectly fine, as soon as i connected them i was all set. my pc is running windows 7 with a sapphire AMD radeon 7850 graphics card. is there some initial set up that i need to do on windows for them to sync up? thanks!