New U2412M with green lines and other glitches

I just bought a U2412M for use as a secondary monitor, but when in use there are quite a few green flickering dotted lines across the screen; I've also noticed persistent horizontal white lines in areas of gray. I would assume this is a driver issue, but I've since updated drivers for the video card (NVidia GeForce GT 540M on an ASUS A53S laptop running Win 7) and monitor itself--no change at all to the glitching.

Note that I have an older 2405 FWP at home that works great as a secondary monitor.

Thank you for your time.