I used with a 2007 MacPro an Apple Cinema HD Display 30" whose resolution is 2560 x 1600. Now, connected to an end 2012 iMac 27" the maximal resolution is only 1280x800. How can I restaure the old resolution ?
Problem of resolution of an Apple Cinema display 30" connected to an iMac27".
iMac (27-inch, Late 2012), OS X Mavericks (10.9.5), Apple Cinema HD Display 30"
