i just bought another s2240l yesterday and the other was bought at december 2012. I'm using Ati 7870 graphic card with 1 hdmi and 2 mini display port. so 1 monitor was plug into the hdmi port and the other was thru a mini display port to hdmi (passive) converter. however, both monitor was in different input color format, 1 monitor was in RGB mode (HDMI) while another was in YPbPr (mini display port converter). Which result in 1 slightly bluish and another slighly yellowish. If i change either 1 monitor to the same as the other, the color will be wash off.
Any recommendation to solve this issue? thank you.