I have an Acer UHD4k2K monitor hooked up to my Retina Mackbook Pro. I was previously using an HDMI cable (only 30Hz), as that's what came with my monitor.
A Thunderbolt cable that's long enough arrived yesterday and I can't get it to detect the display.
I'm plugging a thunderbolt cable into one of the thunderbolt ports on my Mac (I've tried both) and into the MiniDP port on the monitor. I've tried rebooting, jiggling, etc.