SOLVED: Apple's AV adapter with an HDMI cable solved the issue and allows me to use my Dell 34" (U3415W) monitor at native resolution (3440x1440) @ 60Hz. ....... I'm running into one big issue since switching from my 15" Macbook Pro (mid-2015) to the 13" Macbook pro (late-2016). The new laptop will not recognize my Dell 34" monitor. I previously had my old Macbook Pro connected to the monitor with a mini displayport cable. I never had any issues with that setup. I purchased the Thunderbolt to mini displayport cable from Apple but when I hook that into the computer and the mini-displayport cable, the monitor just hibernates and the computer will not detect it as a display. I've tried rebooting the monitor and computer, switching the thunderbolt ports on the computer, as well as trying to force the laptop to detect the monitor but nothing helps. I'm planning on picking up thunderbolt to HDMI and a thunderbolt to DVI adapters to test tomorrow. But I don't see why the mini displayport adapter wouldn't be working since the mini displayport cable was working perfectly fine for my old setup with the same monitor. Any ideas?