This might be a stupid question but is input lag on a monitor only a problem for playing games? I am thinking of getting the Dell 2408WFP for photography work, general use and for watching tv and DVDs. I won't be playing any games but could the input lag give an annoying lag between sound and whats playing on the screen when watching DVDs, or is input lag only related to user input (ie mouse/keyboard) and whats shown on the screen?