Ignore this post....I see the multi page thread on this issue already.
Im wondering why PC mode is disabled on the 6 ,7 ,8 and 9 series when a 720p source is connnected to HDMI2 ? For some reason PC mode only works from a 1080p source.
Im trying to reduce the input lag on a 720p game im playing. I dont want to use game mode because it lags 30ms more than PC mode and there is absolutely nothing customizable in the picture menu in game mode.
Is there any reason behind locking 720p sources from working with PC mode.
Heres a link showing some input lag tests ive done on my LN55A950
http://www.avsforum.com/avs-vb/showthread.php?p=15826054#post15826054

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic