OK both of my monitors are the same make and model and both are connected via DVI but only one monitor dose full screen all the way... I've even made each monitor the main one. But only the 1 does it properly and yes i've check all the settings on PC and the monitor them self's that's including Nvidia control panel. And i was using the other to monitor to play my games on.. which I've only found out today the other monitor does it better.. so that's now my main one..i still don't get whats the problem tho both are the same. If i can't fix it no worries i think I've got the right now anyways.