According to previous post, the problems with U2413 monitor and Inverse Ghosting should have been fixed with new revisions:
http://en.community.dell.com/support-forums/peripherals/f/3529/t/19532239.aspx
I have just purchased a new 24" U2413 (on 14 Feb 2014) from Dell Ireland and getting really bad green inverse ghosting on just scrolling simple web pages. The REV number on the back is A00 but according to that previous post it says the latest revisions may not be reflected in the label on the back. How can I find out what revision it is and whether I should be able to change setting to get rid of this ghosting issue?