Imac running Yosemite won't detect external display

I previously was using a 2008 iMac desktop and running OS X Yosemite. I was using dual monitors (other monitor being Insignia brand) and everything worked fine. Since this was an earlier mac version, I was using the Mini DVI to VGA Adapter to connect. Last week, I got a brand new iMac (Mid 2014 version). I am running OS X Yosemite as well, but now it won't detect any displays. I'm now using the Thunderbolt cable to connect so I wonder if that has anything to do with it. But I have used that same Thunderbolt cable before on my macbook and it worked just fine.
I've tried restarting, resetting the PRAM and everything. I don't know what else to do. Help!

Thanks for the reply, but tried everything and it still won't work. Rebooted, installed updates, cleared PRAM, everything. It will not detect the displays at all. Maybe there is something wrong with my VGA cable.

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My mid-2010 10.8.2 iMac won't detect external displays.

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Thanks! This is really starting to make me angry.

If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
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I have an Epson printer on a Wifi network. Windows 7 desktop and and HP Win 7 laptop (my wifes) print to it just fine. My MacBook Pro running Yosemite won't detect it, and I have the latest driver installed. No problem when I had a Canon...

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Hi Kelly,
As someone who has to print from my Mac to a networked printer at home all the time, I can certainly understand how frustrating it must be to have that fail to perform as expected. Let's see if we can get you up and running.
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Thanks for using Apple Support Communities.
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Help: 2011 imac 27" won't detect External Display connected via thunderbolt to HDMI

I have an 2011 imac 27" and I'm trying to connect an Acer 23" monitor as an external display. I'm using a miniDV(thunderbolt) to hdmi cable. For some reason the computer is unable to detect the display. However when I reboot into windows via bootcamp, the display is detected and works perfectly.. Any way to force thunderbolt to detect this?

Well, weird outcome... I took the monitor back and exchanged it for a better model, better brand. The thunderbolt to hdmi cable works fine with this new monitor in osx. Thanks again..

Macbook won't detect external display anymore - Random shutdown injury??

Hi,
my Macbook has the dreaded random shutdown thing happening, often it can't even get through the startup sequence. If I reset the PMU and PRAM and check the disk every week I can keep it running. Applecare are making not particularly helpful suggestions like "run it in safe mode" - hello people, random means it can take days to happen again... I use this computer for work so I need it at full capacity every day!!!
Anyway, enough angry ranting. The casualty of today's RS and subsequent PRAM PMU resetting is my external display (Viewsonic LCD). The macbook is no longer sending signals to it (display says "no signal"). When I ask the macbook to "detect displays" nothing happens. I have restarted the macbook several times and unplugged and replugged the display connection it doesn't help. Yes, I have the AC power cable plugged in on the Macbook (I know it doesn't like talking to the screen if I don't).
The display and macbook have always worked fine together in the past...
Does anyone have any suggestions on how to test for causes or fix this display related problem?
MacBook Mac OS X (10.4.8)
Powerbook G4 Mac OS X (10.4.2)

You don't mention ever having brought the problem to Apple's attention, or what resulted from your request for Apple's help with it. This isn't a universal or widespread problem. It may be a hardware fault in your own equipment that needs to be resolved with a repair, or it may be a software problem (corrupt file, incompatible software conflict, update needed, etc., etc.). You seem to think Apple should have fixed it for you without your lifting a finger, and you're eager to complain about Apple's lack of support. But you've offered nothing to indicate that Apple even knows you need support. You do have to ask for it. Have you done so?
We have no idea what steps you've taken to try to narrow down the possibilities, e.g., making sure the monitor is turned on; trying a different video cable as iVmichael has suggested; testing the monitor with the same cable on a different computer; testing a different monitor with the same cable and then with a diferent cable on your computer; substituting a different cable adapter, if you are using one; applying all applicable system software updates and then Repairing Permissions and Repairing Disk; starting in Safe Mode and seeing whether the monitor is recognized and activated then; seeing whether the monitor is detected in System Profiler; and so on. You may have done some of these things, but you haven't told us about them or about the results.

MBPro won't detect external display on DVI

Hi Folks,
I have a strange problem that gives me quite some headache:
Is use a MacBook Pro 3,1 2.2 Ghz, 4GB RAM, 128MB NVidia something together with a Samsung SyncMaster 215TW.
For the past year I was using my external screen without any trouble, connecting it via DVI to the mac. Every night I turn down the lid putting the notebook in sleep mode and switch off the monitor. Exactly as I did yesterday. But this morning however the external display didn't wake up as usual it did just nothing - was not even detected via the detect display function. And this is still the case right now.
So when I plug (or unplug) the DVI to the external something is still going on. I get the blue screen (don't get that wrong that used to appear just before it would expand the desktop to the external screen, but then it switches back as if there would be nothing connected.
No relevant entries in any logfile. System Profiler shows "Status: No display connected". The display itself says some no connection message if unplugged and - get this - falls to sleep mode right after I plugin the dvi connector to the mac.
I tried all this:
-reboot (with display connected & without display connected and all other imaginable combinations) - no positive result
-the display via DVI-VGA adapter works (but the image is not as nice unfortunately)
-reset PRAM (boot with optioncommand+PR)
-reset the entire thing (no power, no battery and hold the powerkey for 10 secs.) nothing
-connect some other external display to the mac via DVI - works perfectly
-connect the display via DVI to an other macbook pro computer - works perfectly too
-hard reset the display via the (red) support menu - no result
-an other DVI cable - no result
-booted from the leopard install cd - same thing
-booted from an other harddisk with 10.4.10 (removing the internal disk)- same strange behaviour with the old system
-booted ubuntu linux 8.04 - even here the same problem X doesn't recognize the external display if it is attached to the DVI port also no entries to the logs here.
-SwitchResX and tried to reset the display setting from there (vendor id 4c2d & product id 213 & 214) but still no success.
- called the apple support and my distributer of trust - no ideas but could be a hardware fault (mmh ok... but why do all other display I tried work perfectly with that beast of macbook pro but not any SyncMaster 215TW?!? that worked great for the whole last year)
I guess the macbook had a very bad dream that very last night about mac eating foo-bars that crawl through DVI cables from any 215TW display.
As for now I have a date with the local apple service partner -- in three weeks (it's holiday time in g.o. germany). Don't know what to tell him: Probably I'll need to go there with the screen to show them the entire scenario. Hopefully they (still) think it's a problem with faulty apple hardware (or system software) and replace the logic board.
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greetings,
brutus banane

I have recently bough a new Macbook Pro 15.4", it worked first time with a Samsung Syncmaster 2493HM but after a few days the 'detect display' utility ceased to connect, then a short while after on start up I was getting a blank screen with a flashing folder with '?' on it, preventing me from booting up successfully.
I tried the reset p-ram, didn't work then I tried an archive install of OSX and that ironed out all the creases - for a day, there has been no flashing folders on start up but the Samsung has failed to be detected and this morning wouldn't work no matter how many restarts or cable disconnecting attempts.
So I called Apple helpline, told the guy what had happened, he mentioned to try the install discs again with the display connected to see of the MBP sent a signal to it, after choosing the language in the OSX installer, the display was once again recognized! I didn't have to proceed any further with the install discs so quit, reset and ejected the install discs and all seems well again.
For how long i wonder?
I have no idea of this will work for anyone else but it works for me at the moment.
Interested to see when and how this finally gets solved!
T.
Message was edited by: Tyke Tyler
Message was edited by: Tyke Tyler

New macbook pro 15" won't detect external display using vga adapter

Hi there
I've tried multiple monitors and connectors but i can't get my mac to detect an external display. it responds as if nothing is connected. I'm fully up to date software-wise.
any ideas?
thanks for any help!!

Hi, I'm having the same problem, tried to connect both a Viewsonic and a Hanspree. Was happy to find your response here, but I just got the Moshi adapter with the macbook pro so it seems silly it would have gone bad. :/
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^_^

Macbook Pro 2011 won't detect external display.

Firstly - I've searched this problem several times now and I've found this problem in four of five discussion topics on this board, each with 4 or 5 pages of people adding "I'm having the same problem" but in all of that there wasn't a single response from Apple, instead they just 'archived' the discussions and hoped that people would just go away.
That's pretty ******* disgusting customer service, considering the amount of money we're paying for your products. You owe us at least for them to ******* work properly - not just ignore major problems, which are clearly present for quite alot of your customers.
For months I've had no problems just plugging my MBPro into an external monitor by DVI using the Apple certified DVI-thunderbolt connector.
For some reason, a few weeks ago, the MBPro stopped detecting the monitor.
I have to spend about 20 minutes ******* around, unplugging and replugging in the leads, restarting with and without the leads plugged in, resetting the p-ram, reinstalling OSX 10.7 and it always seems to be just a random time when it decides to start working.
I'm not just some kid ******* around with an expensive computer for the fun of it. I make a living using this system and I need the big screen for the work I do. I don't have the time to spare every sodding day to be ******* around with **** that doesn't work properly.
At first I thought the problem was restricted to just my work display as it appeared to work fine on all other displays. However, last week I was giving a presentation at work to a company who were potentially about to spend mega bucks giving us some work. I turn on the screen and plug in my computer to show the presentation. Nothing happened. luckily I was able to quickly transfer the presentation to another working computer (a PC) and continue on.
But seriously, please justify spending over £1000 on a computer that can't perform the simplest of tasks without spazzing out?
And secondly - stop ignoring this problem and get fixing it. Now!

Hi, I'm having the same problem, tried to connect both a Viewsonic and a Hanspree. Was happy to find your response here, but I just got the Moshi adapter with the macbook pro so it seems silly it would have gone bad. :/
I suppose I'll take it into the Apple Store and see what they say. Thanks!
^_^

MacBook suddenly won't detect my display, Using Mini Display Port to VGA?

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dohdoh1985, I have the exact same problem also! I recently bought a 42" RCA LCD TV. I connected my MacBook Pro to my TV using a Dynex Mini DisplayPort to HDMI adapter that I got from BestBuy. It worked great until I upgraded to Mac OS 10.6.4 and then it suddenly stopped working. Same TV, same settings, same cables, same adapter. Nothing changed since the last time it worked except that my OS was upgraded to 10.6.4, so i am assuming that is the culprit. The symptoms are EXACTLY the same as what dohdoh1985 described; when I plug in the TV, the laptop display flashes (3 times) as though it is detecting an external display and the picture on the TV briefly goes from blue to black for about 1 second then back to blue. The TV does not appear in the display menu / control panel and there is no sign that the MacBook detected it. I went through the usual troubleshooting steps (reset PRAM, checked connections, tv settings, etc) but nothing worked. Other HDMI sources (i.e. Blu-ray player) work fine on the TV using the same HDMI cable on the same port so there is nothing wrong with the cable, the TV or the TV's input settings.
Meanwhile, I can still connect my MacBook to my external ViewSonic monitor at work without any problems. It's just the TV that's not working.
I cancelled my cable subscription a while ago since I only watch shows online nowadays and this was my only way of watching TV shows, so I'm quite upset.
Apple, please help!

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this test is to determine whether the problem is localized to your user account. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault in OS X 10.7 or later, then you can’t enable the Guest account. The "Guest User" login created by "Find My Mac" is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

HT5167 after I updated to 10.7.4 my macbook pro 2011 doesn't detect external display anymore what should I do?

after I updated to 10.7.4 my macbook pro 2011 doesn't detect external display anymore what should I do?

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