It only takes a minute to sign up. My MBP will no longer detect external displays. It was working fine a few hours ago at work, I got home and plugged in the external display as usual and turned on the machine and nothing. Using the "Detect Displays" does nothing. I have tried re-plugging the mini DVI display port adapter and have tried using a different monitor with a different monitor cable. I have tried shutting down and booting without the adapter plugged in and then plugging in the adapter.
Nothing works. Is there some trick to force my MBP to see and use the external monitor? It was working until one day it simply stopped working. Since I had a lot of displays at home, I tried -like you- different cables and displays to no avail until I found another adapter and boom, it worked. Another way to test this is go to an App Store or similar with your machine and your cable. Try to make it work there. If it doesn't, they will have extra adapters to rule out that possibility.
If a new cable, display, adapter also fails, then your Mini-DP port could be failing and that requires an App Store anyway…. Try resetting the parameter RAM using these instructions. You can also try resetting the SMC using these instructions. Sign up to join this community. The best answers are voted up and rise to the top.
fixed : MacBook’s external monitor screen stays black
Home Questions Tags Users Unanswered. Macbook Pro will no longer detect external display Ask Question. Asked 8 years, 11 months ago. Active 5 years ago. Viewed 39k times. Jason Yost. Jason Yost Jason Yost 2 2 gold badges 4 4 silver badges 8 8 bronze badges.
To confirm the NVRAM reset did it for me - the laptop looked as if the connector on the board was faulty but I did this and everything is working perfectly. I had the same problem, a simple restart fixed the problem for me. Active Oldest Votes.
Martin Marconcini Martin Marconcini It turned out to the the adapter cable, I purchased another one today and plugged it in and everything was fine.You can make all of your displays mirror each other, or extend your workspace with different apps and windows on each display. If you use an external display with your Mac notebook, you can also use closed-display mode.
Extended desktop. Video mirroring. If your Dock is on the bottom of your screen, it appears on any of your displays when you move your pointer to the bottom edge of your display. So that you can move apps and windows across your displays in one continuous motion, arrange your displays to match the setup on your desk.
You can also change your primary display, which is where your desktop icons and app windows first appear. To turn on AirPlay, follow these steps:. Learm more about how to AirPlay video from your Mac. Use external monitors with your Mac Learn how to connect another display to your Mac and choose how your displays work together. On the webpage that appears, the number of displays your Mac supports appears under Video Support. Extended desktop Video mirroring AirPlay.
Turn on extended desktop mode Make sure that your external display is turned on and connected to your Mac. Click the Arrangement tab. Arrange your displays or change your primary display So that you can move apps and windows across your displays in one continuous motion, arrange your displays to match the setup on your desk.
To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved. To set a different display as the primary display, drag the menu bar to the other display. Use video mirroring With video mirroring, all of your displays show the same apps and windows. Turn on video mirroring Make sure that your external display is turned on and connected to your Mac.
Make sure that the Mirror Displays checkbox is selected. Learn more Get help with video issues on external displays connected to your Mac Connect multiple displays to your iMac Pro. Yes No. Character limit: Maximum character limit is Ask other users about this article Ask other users about this article.In my office, I am using an external monitor as my main screen for my MacBook Pro. Thanks for the feedback. I have the same issue and there is absolutely nothing wrong with the monitor.
There are enough reports out there that there is clearly a bug in the thunderbolt 2 to digital display output that can creep up on people. The thunderbolt ports work enough that I ethernet and vga work…super frustrating. Which MacBook do you have?
Could it be you have a MacBook that has gotten rather hot when this problem occurs? Maybe you even have a rather old MacBook that has a swollen battery that is pressing onto internal components like the touchpad so severely that they start malfunctioning? MacBook Pro Retina, inch, Early 3. In that case, start out by cleaning the connectors and ports with a hair-pin, and maybe a tiny bit of alcohol-based detergent. Same problem here. The Macbook is brand new and has been installed fresh latest Mojave All updates have been installed.
Monitor has been factory reset. Computer has been rebooted. Both mac and monitor persist claiming no cable is connected. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.
For some reason, though, today it isn't working at all. I have just tried it on an HDMI tv and have gotten nothing except a "Not supported mode" and a mouse flicker. By the way, it's not just the tv and monitors not working. In the System Preferences it doesn't show any other displays or an option to extend or mirror like usual. I will be getting another cable tomorrow to see if that is the problem.
An important question that I have and what I am most concerned about is that I have gfxCardStatus installed and when I tried using my external display today I forgot to turn it off of "Integrated only".
Do you think that could have broken something since external displays require the other GPU? On very very rare occasions when I unplug the cord I will get a blue screen flash like it is changing display settings. Another thing is that I just recently got my logic board replaced so I wouldn't think that would be the case but unfortunately their day repair warranty is up. One more thing that I have found while scouring the internet is I came across a picture of someones System Report for Graphics and at the bottom of the read-out it says: Display Connector: Status: No Display Connected but mine doesn't say that I don't know if it used to either.
It has to either be my cord or my computer. You need to switch to discrete graphics in gfxCardStatus or dynamic switching for external display support. Your cable is likely just fine. It was a faulty cable. Just got a new one and it works beautifully. The reason why I posted here was basically just to see if the gfxCardStatus had anything to do with it. But thank you all for your help.We purchase our own monitors and put them under the same test bench, so that you can compare the results easily.
No cherry-picked units sent by brands. The MacBook Pro has a great screen, but sometimes, it's just too small. At this time, we don't test for compatibility; if you run into any issues using a monitor when connected to a MacBook, please let us know in the discussions below.
If you're looking for a mouse, see our recommendations for the best mice for MacBook Pro. It also has excellent ergonomics, allowing you to adjust the monitor to your optimal viewing position, and it's well-suited for bright rooms thanks to its good peak brightness and decent reflection handling.
That said, dark room viewing isn't as good, as its contrast ratio and black uniformity are rather mediocre, resulting in blacks that look like gray when viewed in the dark. With a p resolution and a pixel density of PPI, images look sharp and text clarity is decent. Unfortunately, while the monitor does support HDR, it can't display a wide color gamut and its HDR peak brightness isn't enough to make highlights pop. This monitor doesn't offer much in terms of extra features, but it does come with built-in speakers if you don't have space for dedicated ones.
Although it doesn't have a USB-C input, its performance should satisfy most people nonetheless.
How to Connect an External Display to Your MacBook Pro
Another downside of this monitor is its poor contrast ratio and black uniformity, making it less ideal for dark room viewing. The ASUS is a better monitor overall for most people, but if you don't mind a few compromises, the LG is a good alternative. Blacks look gray when viewed in the dark, and there's significant backlight bleed as well as clouding throughout the screen. In bright rooms, though, it can get bright enough to overcome glare and its reflection handling is not bad.
Its bit panel has outstanding gradient performance, but it can't produce dark, saturated colors due to its poor contrast ratio. All in all, if you need more screen space but you want to keep a clean, single monitor setup, this one is a great choice. This gives you plenty of screen real estate to have multiple windows opened simultaneously, and it also has a Picture-by-Picture mode for better multitasking.
Its IPS panel has great viewing angles, and the screen has a gentle curve to help you see the sides. Last but not least, this monitor has a USB-C port that supports DisplayPort Alt Mode, so you can display an image and charge your device with a single cable. The backlight isn't flicker-free, but it flickers at such a high frequency that it shouldn't be bothersome to most people. There are integrated speakers, but connectivity options are pretty slim and there's no USB port for charging.
They are adapted to be valid for most people, in each price range. Rating is based on our review, factoring in price and feedback from our visitors. Be careful not to get too caught up in the details.
Most monitors are good enough to please most people, and the things we fault monitors on are often not noticeable unless you really look for them.
Sign Up Log In View All. New — —. Sign Up Log In. Get insider access. Preferred monitor store Auto BestBuy. My Ratings. Log out. Best Monitors.You can resolve many display issues by updating the software on your Apple devices, cables, and adapters. If you're using a display, hub, extender, or adapter not made by Apple, check with the manufacturer for any updates that might be available.
If your software and firmware are up to date, or if you can't see the image on your screen, try the steps below for your specific issue. These steps can also help if the image on your screen repeatedly turns on and off flickersif horizontal lines appear snowor if the image is distorted torn or scrambled. These steps likely won't help if the issue is only happening in one app.
Use external monitors with your Mac
If you see similar issues in only one window or app, check with the app's developer for updates or more help. If you're using an external display, sleep and wake your Mac to make it check for connected displays:. If you're using more than one display, and you can see the image on one of the displays, you can also use Displays preferences to check for connected displays. If there's no image on your display, try adjusting your display's brightness or contrast.
If there's still no image, or the image appears torn or scrambled, try selecting a different video resolution in System Preferences. If your display works only when your Mac is started in safe mode, and you have display-related software installed, check with the software's developer for updates, or try temporarily uninstalling it. Make sure your display resolution in System Preferences is set to its default.
If you're using a resolution that's scaled, the image might be magnified to fit the display. This can cause the image to look blurry in some apps. Check your display for a "monitor mode" setting to get the best video quality.
If an app you're using appears low resolution on your Retina display, check to see if an update to the app is available. Most apps have been updated to use the higher pixel densities of Retina displays. Lower-resolution images on some web pages might also appear "softer" when viewed on a Retina display. This is because Retina displays have a higher pixel density and not all websites use Retina-ready images.
For example, the images below look different when viewed on a Retina display, but the same on a non-Retina display. This happens because the Retina-ready image has a higher pixel density:. If your entire display image seems too dark or too bright, you can adjust the brightness and contrast from the Displays pane of System Preferences, or by using your display's built-in controls.
Displays not made by Apple sometimes have brightness and color adjustments built into the display. Check the documentation for your display to see if it includes built-in controls.
When you connect a display, projector, or HDTV using an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your device for a "monitor mode" setting to achieve the best video quality. If individual pixels on your display seem too bright or too dark, see these articles for more help:.
This adapter doesn't support connections to Mini DisplayPort displays, including the following Apple adapters and displays:. If you're using the Thunderbolt 3 USB-C to Thunderbolt 2 Adapter to connect to a compatible display and the display doesn't show an image, try unplugging the adapter and plugging it back in.
Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability.
Contact the vendor for additional information. Before you begin You can resolve many display issues by updating the software on your Apple devices, cables, and adapters. From the Apple menu, choose App Store. Click the Updates button in the App Store window.Audio and the camera of the monitor work, but I'm unable to use it as an external display.
Hey, not to downplay your issues I am having the same problem right nowbut it looks like the macOS dev team is aware of the problem. I imagine it'll be ironed out by the next build I know, its awhile to wait.
If I find a temp workaround, I'll definitely post it here though. Thanks for the heads-up, I didn't know it was in the release notes.
Subscribe to RSS
That explains a lot and I'll just wait for beta 5 then I'm not sure of that's the issue. Sound and camera work on the LG monitor. I'm glad you posted this as I was just headed here thinking I'd screwed something up.
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.MacBook Pro fails to connect to TV from Thunderbolt HDMI after OS Update
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.