New answers tagged displayport
If you are using a 27 inch iMac (Mid 2010) then you need a mDP to mDP cable. According to Apple's Support Page, Use your iMac as a display with Target Display Mode, you can accomplish this with the cable referenced above, but only with a 27" iMac if you are using the Mid 2010 model.
Modern Mac's (the hardware) properly support DisplayPort MST daisy-chaining but Mac OS X (the OS) does not support it. This has been proven via BootCamp with Windows. So theoretically Apple could chose to issue a patch to fix the OS and make it DisplayPort 1.2 compliant but they've chosen not to.
From Apple.com's Q&A section: The Mac Mini has two video outputs: a mini DisplayPort and a mini DVI port. The mini DisplayPort is the same one you find on the current generation MacBook, MacBook Pros (as well as the Mac Pro) and the mini DVI is the same as the on the old black/white macbook. and: For 1920 x 1080 connect mini display port to DVI ...
I bit the bullet and bought another DisplayPort monitor (Dell U2414H), and sure enough, it works out of the box! I'm currently running a total of three displays - the iMac built in at 1920x1200, the 24" Dell at 1920x1200, and the 27" Dell at 2560x1440.
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