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0

Changing the resolution will reset the GPU. I recommend the QuickRes app, since you can also set keyboard shortcuts. Read more here http://www.macworld.com/article/2012693/mac-gems-quickres-helps-you-get-the-most-out-of-retina-displays.html


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Unless one of the displays is a Thunderbolt display, you cannot connect two displays to a Belkin Thunderbolt Dock (see this question). As neither of your displays is using Thunderbolt, you have two options: Connect one display to the dock and one to the MacBook Pro. One end of the cable (going into the dock or MacBook Pro) could be HDMI or Mini ...


1

Based on my experience with Macbooks, I suspect there is either a loose connector, or (sigh) you have a dying chip on the motherboard (probably video controller). Genius Bar should be able to diagnose for you pretty quickly.


1

Well, i guess you solved your problem by now, but I still wanted to answer, since I recently looked into eGPU options myself. If your sole aim is to run a 4K monitor (and your GPU doesn't support it), you could probably also get a USB graphics adapter. You find a selection here. This certainly is a much cheaper option, but probably too slow to watch ...


0

A single dual-link DVI connection can deliver up to 2560 × 1600 at 60 Hz. Achieving 4K at 60Hz requires two dual-link DVI cables, or DisplayPort 1.2 or HDMI 2.0. So, yes, as you put it, that's a limitation of DVI.


0

That is a tough one. the Mac sees that there is a display there and even has it's resolution and other specs. So the OS sees and enumerates it, yet only the back light is on. That may indicate that there is an issue with the replacement display, or that something was damaged or not installed correctly (crossed, damaged wire/conductor/connector). You are ...


-1

I tried all the above suggestions, but it didn't work for me. But now, I solved it! After many, many days of frustration and hours wasted. I did a reset on the PRAM and it worked like a charm. The instructions are here http://www.macworld.com/article/2881177/how-to-reset-your-macs-nvram-pram-and-smc.html


1

You can use the program ScreenRecycler to use another Mac (or even a PC) as a second monitor. http://www.screenrecycler.com/ScreenRecycler.html


1

Copper-based Thunderbolt cables are limited to max length of 3 meters. Corning sells optical Thunderbolt cables you will need for the distance you specify here. You can get 10m lengths at Amazon for US$299. They come in 30m and 60m lengths for US$659 and US$1299, respectively. I haven't had the need for these lengths yet, but I did the research a few weeks ...


1

Do NOT use the HDMI video output! Please buy a Mini DisplayPort cable connect your MacBook and U2715H.


0

I had the same problem and I used gfxCardStatus v2.3 to switch to Discrete only graphics card and now it works.


0

I had the same problem and I used gfxCardStatus v2.3 to switch to Discrete only graphics card and now it works.


1

Yes, I think keeping the power on here is the key. When I remove the magsafe from my MBP it automatically goes to sleep and turns off the external display. If you really want to keep it from sleeping even when you are not connected to an external power source, you can use InsomniaX or Caffeine.


0

My solution was the following. Yosemite 10.10.3 7/15 Goto System Preferences / Displays Menu up to select "Window" - select the display you wish to rotate. On my Dell Monitor - (model 1908FP) there was an option to "Rotate" toward the bottom.


14

Yes, its called "closed clamshell" mode. In short, you'll need to attach your MBA to a mouse, a keyboard and power: https://support.apple.com/HT201834


0

It sounds like you have the external display set as the primary display. Take a look at this article on how to set your primary display. Set the Primary Display on a Mac


0

This is a workaround. I have a similar problem to the OP. I found that I can make the display sleep and stay asleep via the command line: pmset displaysleepnow In contrast, the external display wakes immediately after sleeping when I use the hot-corner method. Since display sleep problems can have many causes, my general advice is to try different ...


0

I bought one (the Dell P2415Q) so can offer the results... Scaled options are: 1504x846, 1920x1080, 2304x1296, 2560x1440 and 3008x1692 That is to say, the macbook always outputs 3840x2160, 60Hz as far as the monitor is concerned. It just "looks like" those resolutions in terms of real-estate. 1920x1080 is the default, and other scaled resolutions are ...


0

if you have problems dragging the mouse due to resolution differences between monitors. Go to System Preferences > Dock > "Position on screen:" click "Left" and the doc will move back to the main monitor. You can then click "Bottom" and the doc will move to the bottom.


2

I had exactly the same problem, with the same monitor, Dell U2713 / U2713H / U2713HM / U2713HMt. I had two of them plugged in to my late-2014 Retina Macbook Pro 15" and only one was experiencing the problem. I tried 100s of different solutions (I can say for sure it's definitely not the cable!) and nothing worked. Just like you, I could get landscape ...


2

You won't know until you actually get it and test it. HDMI specs say you should get 5v at 50mA. That's not much to start with. You can read about this more from here. You could get more power but it would have to have MHL (mobile high definition link) support. That will be able to give you up to 40 watts. Now, I looked on the Apple site and it ...



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