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Page content loaded. Mar 25, PM in response to malin In response to malin Thanks for reaching out to Apple Support Communities. First, try the following:. If your Mac starts up to a blank screen. If the issue continues, you can reach out to Apple Support using the link at the bottom of the page. We hope this helps. Mar 25, PM. Community Get Support. Sign in Sign in Sign in corporate. Browse Search. Ask a question. User profile for user: malin malin More Less.
First plug in mini-display port. The external monitor should always work now even though sleep and shutdown. Other Solutions If you have any other problems or solutions about external monitor detection issue, do let us via comment.
I have MacBoo Pro 13" and recently installed El Capitan and lost ability to use my laptop for my presentation. It doe snot recognize external projector. This button does not exist on my Apple Book Mac pro. The good news is that you can upload your slide presentation on a memory stick and, use any cheap and cheerful Widows based laptop and it works beautifully.
After spending two entire days in a Apple store trying to make the external monitor work I bumped into this this topic on the third day. Did the first solution and finally I was able to see the external display for like, 5 minutes. Then I turned off the monitor, left home. The display remains dark, my laptop recognize 13" Macbook Pro model it but the display wont show the desktop or anything else. Tomorrow I will return my monitor and will buy a Thunderbolt display.
Any additional ideas? Thanks, Sylvain. Macbookpro running ElCapitan. External display connects to laptop with 2 usb ports. Display not recognised. Sylvain, Sudha, Mary, Boris Were you able to fix the 2nd screen issue, as I too have an LG with the same problem that it was working and now has stopped suddenly.
Tried Solutin 1,2 and 5 but no progress. I recently had this problem and it turned out that the mini-DisplayPort adapter had gone bad. I had this exact problem where my mac wouldn't power on. I uninstalled Diablo 3 as recommended and now everything works a treat. Kudos to you brother! Could be that graphics switching is set to auto and that external displays only work when it is switched to manual. I never write comments on blogs but, solution 5 solved my issue…..
I thought I had to wait an update. And thanks to your comment I found a solution as well! I'm on Sierra. I have a mid '15 MacBook Pro Retina. I recently bought a second external monitor of the exact same brand and type only a newer model 27MP I first plugged both in at once, but did not get a signal from the new monitor.
The old monitor still worked. So I unplugged the old monitor and solely plugged in the new monitor. I still doesn't work, even as a single monitor. I then reset all my PRAM and toyed with the resolutions, and basically tried every step you have listed above, yet my computer will still not recognize it. The monitor knows its plugged in, but just says that it is not receiving a signal. I double checked the resolution and it was using the native one, indeed. Then I disconnected the monitor and placed it properly on my table.
When I connected it back again, it just did not work. Mac's display flashes each time monitor is connected, but monitor says no signal detected. I tried many things, including suggestions from this page, but none of them worked. It's really annoying as I have this huge beautiful display and I saw it working for a few minutes. This is really a weak part of Apple's OS and a very frustrating experience.
The first time when I connected the monitor it displayed the mac desktop screen but when I switched on mirror display then it just vanished and it won't show anything. The external monitor repeatedly going into the power saver mode.
Tom Nelson is an engineer, programmer, network manager, and computer network and systems designer who has written for Other World Computing,and others. Tom is also president of Coyote Moon, Inc. Jump to a Section. Watching your Mac display suddenly distort, freeze, or refuse to turn on is never a welcome event. Unlike other Mac issues, you can't delay dealing with a misbehaving display; it must be addressed immediately.
If you are lucky, the glitch is just a glitch, temporary in nature and not necessarily an indication of continuing troubles to come. In many cases, display problems don't return after a restart. Assuming the problem you're having is indeed a graphics issue and not one of the startup issues that manifest themselves as a display that's stuck on a gray screen or a blue or black screen , taking the time to run through these troubleshooting tips is a good idea.
If you're using an external monitor, you might have trouble with your Mac not detecting the display. Here's how fix that. You might be surprised at how many times turning your Mac off and back on fixes issues such as display problems. Restarting your Mac puts everything back to a known state.
It clears out both the system and graphics RAM, resets the graphics processing unit GPU and the central processing unit CPU , and then restarts everything in orderly steps. This may seem obvious, but if you're using a separate display, one not built into your Mac, you should check that it's turned on, the brightness is turned up, and that it's properly connected to your Mac.
You may scoff at the idea that a cable came loose or the power somehow was turned off, but kids, adults, and pets have all been known to accidentally unplug a cable or two, push a power button, or walk across a power strip switch. If you're using a display that is an integral part of your Mac, make sure the brightness is set correctly, if you can. The SMC controls a built-in display's backlighting, detects ambient lighting, and adjusts brightness, controls sleep modes, detects the lid position of Mac laptops, and a few other conditions that can affect a Mac display.
Use Safe Mode to isolate graphics issues you may be having. In Safe Mode, your Mac boots into a stripped-down version of the Mac OS that only loads the bare minimum of extensions, disables most fonts, clears out many of the system caches, keeps all startup items for starting, and deletes the dynamic loader cache, which is a known culprit in some display problems.
Before testing in Safe Mode, disconnect all external peripherals connected to your Mac, except for the keyboard, mouse or trackpad, and the display. After your Mac restarts in Safe Mode, check to see if any of the graphics anomalies are still occurring. If you're still experiencing the problems, you have a possible hardware issue.
Jump ahead to the Hardware Issues section. If the graphics problems appear to be gone, then your problem is likely software-related. Check any new software you've added, including Mac OS software updates, to see if they have any known issues with your Mac model or with software you're using. Most software manufacturers have support sites you can check. Apple has both a support site and support forums where you can see if other Mac users are reporting similar issues. Restart your Mac in normal mode, and then run your Mac with only basic apps, such as email and a web browser.
If all works well, add any apps you use that may have helped cause the graphics issue one at a time. But the MBP that just arrived does not. Thanks for saving me the rest of my weekend by being quicker than me dealing with this. I have a slightly different problem. I don't see this issue listed in the release notes of beta 4.
The dual setup actually worked until my MacBook Pro went to sleep. It did not go to single monitor support until it awoke from sleep mode. I too am looking forward to an update that resolves this. Indeed on my '18 15" 2.
If i take the plug out and plug it in again - everything is working fine. Started with Mojave. The problem strikes back. I'm also having problems with the new Mojave Beta 7 with the external display and my MacBook Pro 15'. But after I put the MacBook for a couple of hours to sleep, it doesn't recognize the external display anymore. I first have to open the MacBook, disconnect the cable and plug it back in again.
Search by keywords or tags Submit Search Clear search query Additional information about Search by keywords or tags Supported Searches:. Click again to start watching. Beta macOS. Asked by ZuluDesk. Copy to clipboard Share this post. Copied to Clipboard. Add a Comment. Accepted Answer. Cheers, Jake. Posted by jakecast. Post marked as solved. Adjusting screen brightness settings might not take effect, and external displays might not light up.
Posted by XenoPhage.
Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image. If you still see a blank screen after about 20 seconds. zurg.patrick-kinn.com › en-us. How to fix MacBook Pro screen black · Check the power of your MacBook · Check screen brightness level · Force restart your Mac · Resetting the NVRAM.