Hi, I have a Retina Macbook Pro. Currently I run it with 3 monitors. Thunderbolt to 30inch Dell monitor with a box that converts the signal to DVI Thunderbold to a 27 inch non thunderbolt iMac using a mini-display port cable And the laptop screen itself. I have an Apple 24inch LED (non thunderbolt) monitor. I'm wondering if there's a way to add this in via the unused HDMI port on the Retina laptop. I see a lot of mini-displayport to HDMI but not HDMI to mini-displayport. My impression is that the mini-DP to HDMI only go in that direction. Any advice would be appreciated. Thanks!