Hey there. I have a 2011 iMac 27", the model with 2 thunderbolt ports. I have 2 dell U2410s connected to the iMac via the TB ports using MiniDisplayPort-to-DisplayPort cables. Now everything seems to be functioning fine, but I've noticed a small "burned-in" image on one of the U2410's. It actually looks like a frame from the screen saver. The frame from the screen saver is luckily pretty light and sparse, but every time the screen is supposed to be completely blank/black it's there, and it also seems to be continuously present, as I can see it affecting the image on the monitor, in some cases more than others depending on the color. A grey or black-dominant image shows it through more. Do you think this is an issue with the video card on the iMac, or with the Dell monitor? I've tried resetting the monitor and refreshing the displays on the iMac. Whole thing doesn't make much sense to me, as I thought "image burn" happened on a static image sitting on the screen for a long time, and this particular image is from the screen saver, which is constantly changing. Thanks for any help.