Okay so I'm using a Dell Ultrasharp 2407 as my main screen, and I just recently got a Dell E248WFP. I'm asking if anyone can actually advise me to keep it. I've done a ton of calibration and setting changes and have finally gotten the colors correct for the middle of the screen, but the top of the screen is VERY dark while the bottom is VERY bright. Is this a regular characteristic of this model because I cant stand to look at it. Is it defective maybe?