Hi, I am having problems with external monitor setup and appreciate any helps. Here's the story: I got a bargain to get a DELL 30" Monitor that supposed to support 2560 x 1600. It is an old model (my rMBP recognised it as DELL 3007WFP). The problem is, I can't get it to show past 1280 x 800. What can go wrong? FYI, my notebooks has Intel Iris 1536 MB, whatever that means. So far, I have bought the Apple Mini Display Port to Dual-Link DVI adapter. I've tried to plug the USB port to my notebook and also to a dedicate wall plug adapter. No luck. I bought a Dual-Link DVI cable (24 pin) and still, whenever I set the resolution higher than 1280 x 800, the screen just show random lines. It is very frustrating, I have been trying for almost two days, not to mention the money I have spent just to find out it still doesn't work I was hoping whoever have similar experience can shed some light on what may be the problem and help me get my weekend back. Thanks in advance.