You may be running into the Apple Cinema Display UEFI bug. Basically the Cinema Display will not display the bios and boot up sequence when connected to a UEFI motherboard system. I have the 24" model and I can't use it on my Gigabyte UD3H or UD5H board since they both are UEFI. When I used the old bios on the UD3H it worked fine. I've experienced it with both my 6850 and gtx670.
The goods news is that once the OS boots up takes over the system everything works fine, I just can't access the bios.
My advice is install your OS and test everything with aNother monitor. Then connect the Cinema Display, let it boot and wait to see if you get into the OS. If works, then you know it is the uefi issue and cannot be fixed.
You can do a search for "cinema display UEFI" to see more on this topic.