Hello, I have a 2012 mini with a dell U2413T monitor connected over HDMI. I recently got a UP2414Q 4k monitor. I connected it using a mini-DP to mini-DP cable. OSX 10.9.2 defaulted the monitor to 4k resolution, but there was a lot of garbage on the monitor. It's hard to explain -- most of the screen is fine, but there's areas of the screen that have intermittent blocks of color. Then it'll go away. Then come back. There also some obvious texture garbage on the cursor as well. BTW, the garbage also isn't constant. It seems to hit random areas of the screen and also occasionally clear up for a second or two. I thought it might be due to the cable, but the garbage also occurs on the U2413T when the 4k is connected. I thought it might be due to multimon, but the same occurs if the 4k monitor is the only monitor. I thought it might be due to 4k, but the OS selected it and initialized it to 4k by default, so Apple thinks it should work. Finally, I upgraded to 10.9.3 for the HiDPI settings and it still persisted. I've attached some pics. Anyone seen this before? Any idea on a fix? I have AppleCare on the machine if an actual hardware problem is suspected. Thanks, SC ETA: If I leave all the connections alone, and just scale the 4k display to 1080p, the issue goes away. So it is somehow relevant that 4k is in use.