I am sure the adapter cables and the ports on the display are working since I tested also with a Windows notebook. My current compromise is a mini DisplayPort to HDMI adapter, which works but only delivers 1080p, whereas the display is able to show 2560 x 1440. I have tried several adapter cables with always the same result. You can actually move the cursor onto the display and change resolution and refresh rate settings. The MacBook recognizes it is connected to the DELL display. Whenever I connect the MacBook with the monitor via a mini DisplayPort to DisplayPort cable it just shows a "No DP Signal from your device" error and goes to sleep. ![]() ![]() DELL U2719DC not working with 2014 MacBook Air I am using a DELL U2719DC with a MacBook Air 13" Early 2014.
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