So I haven't really used my PC for about 5 months, as in it was unplugged and boxed. The past week I hooked it all up to play a few games, but cannot for the life of me get the resolution back up to 1080p. All I get is 1600x1200. Got a Sammy 24' screen and a 5870 and been playing at top resolution for all this time. Any ideas?