Not a problem, as there is a bit of variation in all monitors. The factory settings are far from ideal. There are published settings after hardware calibration.... Brightness 17, Contrast, 65, RGB 251/235/242. I set mine to that but found there to be a bit too much red and toned it down a bit. Suggest you try those settings, then adjust as necessary to make them all match as best you can. I have 3, 20" for charts.. and their white background intensity varies a bit. My chart backgrounds are black and I notice no variation at all.