MacBook Pro External DVI Monitor Full Resolution not available

I have a new macBook Pro 13" and a 30" apple monitor. I am connecting this monitor via a DVI, and am unable to retrieve a list of all the supported resolutions for the 30" monitor. The Mac book only allows be the same resolution range as its built in screen. How can I change the resolution on the Mac Book to increase the resolution on the 30" external monitor.

Thanks,

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3 Answers

Have you tried going to System Preferences -> Display? When you have the 30" display plugged in, there should be an Arrangement tab, where you can uncheck the Mirror Displays setting. This should give you access to the resolutions of the 30" display.

Are you using the Mini DisplayPort to DVI or the Mini DisplayPort to Dual Link DVI port? The standard DVI adapter won't be able to run the full resolution of a 30" monitor, and you'll require the more expensive Mini Display Port to Dual Link DVI adapter to use the full 2560x1600 resolution.

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I had the same cable & monitor and the same problem. Solved by using a stock HDMI to Mini DisplayPort cable. My colleague notes that some pre 2012 MacBooks are picky about the quality of the HDMI cables, but my 2012 15" Retina MBP worked fine with the cheaper cable.

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