External display recognised, but no image

I have attached my MBP to an external monitor.
Yosemite does recognise that there is an external monitor connected and it even knows it is a Samsung.
But the screen stays black. The internal monitor screen keeps working just fine.
In the display options, if the mirroring is on, I get two screens.
Remarkable is that the secondary window (the mirror) which is mentioned as the internal display says it is optimised for the Samsung. This one shows a blue screen.
The primary window (which has the "Arrangement" tab and which is called "Samsung" in the title) is also optimised for the Samsung. The screen on this window is black.
If I change the "optimize for" choice in the one window, it also changes in the other window.
Clicking on "Gather windows" has no effect (the screen refreshes, but the result is the same)
I have attached the MBP via a (Henge Docks) mini DV to DVI adapter which is connected to another adapter (DVI to VGA) which is finally connected to a VGA cable that goes to my monitor. This seemed necessary as Henge Docks does not seem to provide a mini DV to VGA adapter.
I have checked and unchecked the mirroring checkboxes several times.
I have also unconnected and connected the adapters and cables several times, rebooted the MBP and switched off and on the monitor several times.
Thanks for your help!

Do you know what resolution your Mac is trying to display on the samsung monitor? If it's one the samsung can't display, you may get a blank screen.
Try installed SwitchResX and setting the display to a known displayable resolution.

Similar Messages

Display not working, external display does, but blue screen when windows loads

Hi folks, wondering if anyone can help.
My DV6's display is no longer working. An external VGA display works, but when it gets to the "welcome" screen as it loads into windows, I get a blue screen. I was able to load into safe mode previously, but I foolishly reformatted and reinstalled windows thinking it might solve the problem. Now I can't even get into safe mode because it won't allow a first time setup of Windows in safe mode.
I suspect this may be the death of my loyal notebook, but was hoping someone could propose a solution.
Thanks!

HI @Mikep037,
Thank you for your query, I am happy to assist you!
I understand that you are having an issue with your display.
You have reformatted and reinstalled Windows but are unable to complete the setup.
Did you do a recovery or did you reinstall Windows from a retail disk?
First I would try a hard reset. HP Notebook PCs - Use Hard Reset to Resolve Hardware and Software Issues. Please be sure to remove any CD/DVD from tray and disconnect all externals devices or USB's.
HP Notebook PCs - Overview of How to Troubleshoot Problems When a Computer Does Not Start Up or Boot...
Here links to aid with the recovery process.
HP PCs - Performing an HP system recovery (Windows 7)
HP Notebook PCs - System Recovery May Fail or Display Error Message (Windows 7, or Vista)
Best of Luck!
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

External display recognized but not working?

So, I've got kind of a weird problem.
Whenever I connect my iMac (through the Thunderbolt port) to my 32" RCA HDTV via a displayport to HDMI adapter, it shows on my iMac that there is a display connected (TTE HDTV), but my TV isn't recognizing it. I have tested the port/TV using my Windows laptop with a (native) HDMI port and there have been no problems.
I would think it was the cord I bought, except that my iMac recognizes an external display. It doesn't seem to be the TV's fault, and I've tried every resolution setting.

Yeah I have been having the same problem. When I'm looking at the Display Settings, it comes up with Samsung 1080 when its connected, however the tv doesnt recognize it. And if i unplug the HDMI cable from the adapter, the Tv options go away. There must be some sort of TV setting maybe? I am also using a passive adapter.

I have an aluminum MacBook with Lion OS. I have hooked up a Samsung external HD monitor, but the image is slightly blurry.I also see a message for a second which says Analog.What to do??

I have an aluminium MacBook and have just connected an external Samsung HD monitor. The image is blurry and I cannot seem to fix it.
The MacBook display is 1280x800 but the maximum for the external monitor is much higher. Also the external monitor sometimes displays a (rapid) message implying that it's getting an Analog signal.
How can I fix this??

FWIW, reformatting a USB disk is almost never an issue, and it's quick.
Buy a cheap external USB disk (regardless of the provided Windows or OS X or other disk format) (that's larger than your internal disk by some measure) and preferably buy a disk from a vendor that offers the right to return the disk if it doesn't work, connect the disk to your MacBook, wipe the disk and reformat it with Disk Utility, perform the backup (probably also using Disk Utility from the Utilities menu, while your MacBook is booted from the installation DVD), and then commence with the OS X upgrade.

My HDV camera is recognised, but no image or data appears in log window?

I'm trying to download footage from my Sony HDV camera. FCStudio recognises the camera, device control works, but no data or image appears in the log and capture window. I've reinstalled FCP, trashed preferences, still doesn't work. Help please...

My camera HDVA1P is considered 'not supported' by apple, therefore inconsistent. That's why sometimes it downloads and sometimes not with FCStudio 5.1. I upgraded to OS10.4.8 and FCS5.1.2 and it seems to be downloading again. We will see how long it lasts. By the way, Apple Support was incapeable of giving me this simple solution because the list of cameras supported is North America-centric and does not list the PAL professional version of my camera. My camera salesman was able to tell me the equivilent that does appear in the list.

External display mirrors but will not work side-by-side. What is wrong?

I am using a VIZIO HD TV as a second display . Setting the TV to 1920 x 1080 (it's max) and the iMac to 1920 x 1200, the two displays work correctly in the "Mirror" mode. When I set the "Arrangement" to side by side to create another display space, the TV displays the Invalid Mode error. The behavior does not improved when the two displays are set to lower resolution levels. This same TV works fine in all modes when connected as a second display to my Mac Book Pro.
Any ideas?

I apologize to everyone who is following this but I have a dilemma which I think Mr. Brody may be able to solve and I know of no way to contact him other than the forum.
Mr. Brody, you may be the "Geek" (compliment) I am desperately looking for, No one in our area .. and AppleCare (on all three of my units) has no answer.
I added an ASUS VH198T 19" monitor for viewing tutorials while working in Adobe Lightroom and Photoshop. DVI to mini for iMac. The ASUS runs at 60Khz and 1440x900 where the iMac is, of course 1680x1050. Each time the ASUS goes to sleep is closed, when it restarts, the iMac apparently sets it to one of it's standard resolutions 1600x900, unfortunately that's a little higher so I get flashing of the ASUS and ... WEIRD > Magic Mouse goes nuts with pointer jumping all over. Apple had a tech come by for the Mouse, wouldn't even consider the monitor, not an Apple product. Tech found nothing. I have talked with ASUS several times, they say it is the Mac and I now think they are right, especially after they sent me a replacement under terms of their warranty, very generous. It does the same! Both monitors work on our Xp Laptop, it lets me set the resolution to whatever I want.
When 'mirrored' the resolution IS set to 1440x900, works fine when return to individual UNTIL the next time it sleeps or turned off. Any suggestion???
Can Terminal allow a change from 1600 to 1440?? If so, how?? I'm not Linux or Unix literate, among other things.
Will most gratefully appreciate,
Ed in Pensacola

Very frustrating problem with external display-works but doesn't

I just set up my new LED Viewsonic monitor with my new MBA and it works flawlessly...except when I first want to hook it up. When I first want to use it I plug everything (laptop is closed) and then proceed to turn on the monitor. When the monitor turns on it shows white noise UNTIL I open my laptop and go to the general settings. Why the heck is this happening?! I have it from HDMI out to a HDMI>DVI converter into the back of the monitor. It's just annoying and seems very peculiar. This also happens when everything is already working and the computer goes to sleep and I try to wake it up=white noise, until I open it up and go to the display tab under general settings.
I appreciate any help that anyone can offer!!
Thank you!

I feel kind of stupid, but I guess I all I had to do was wait about 5-10 seconds and then it worked. Nevermind

External HDD recognised but won't mount/unmount

I have a 300GB Maxtor HDD in an Icy Box enclosure which I have been using with my PC for over a year now and my Macbook for the last few months.
Lately, I have been having some really annoying issues with it. In short, the drive won't appear to mount (ie it won't show up in the sidebar in Finder or on my desktop) but seemingly it has according to Disk Utility. The drive appears in the sidebar with a 'no entry' sign on it. Trying to verify or repair it in DU results in an error message saying that the drive cannot unmount. Restarting solves nothing. The only way I have found to resolve the issue is to plug it into my PC, fire it up and then disconnect it before using it again on my Mac. This is far from ideal.
I recently installed VMWare Fusion which definitely caused this problem the first time. I shut down Fusion without 'safely disconnecting' the drive from XP and then disconnecting it from Fusion first. I understand that it may be that Fusion is still accessing a file on the drive preventing it from unmounting but I would have thought that a restart would resolve that issue - it doesn't.
I know about the 'lsof' function in Terminal but I do not know what to do after I get the results from it.
Any help would be greatly appreciated. Thanks.

looks like your in trouble with that drive, I assume its a 1TB HD?
It shows on your pic 1TB available, .......bad news,.... run Etrecheck to verify you dont have WD software on your Mac
https://www.macupdate.com/app/mac/48217/etrecheck
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. EtreCheck automatically removes any personally identifiable information from the output.
WD software is known to, on its own accord, repartition and corrupt drives under Mavericks, ...WD has confessed to their erorr in all this.

How do I set MacBook to an external display when the plug and play doesn't recognize it? I am trying to set my Samsung 530 LCD as a monitor but HDMI and VGA cords (and the adaptor for them) doesn't seem to work.

I have tried everything I can find on line but they all claim that the plug and play works, and they don't for me. I tried the mini dvi to HDMI and a HDMI cord and that was not recognized no matter which unit I rebooted first. I found someone who said that my Macbook might be too old for the HDMI technology so I returned the cords and went to the VGA cord and adaptor.
I tried this first with the HDMI setup:
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx= 167919&modelname=LN40C650L1F&modelcode=&session_id=NDhJrD0DQT0Z8KRsm62yhxJxqnyPy SKhlhpB8vQ6h9Q7R2BZJGzj!-1089109758!1761676444!7501!-1!434477884!1761676348!7501 !-1!1292098185857
Then I tried this with the VGA setup:
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx= 167901&modelname=LN40C650L1F&modelcode=&session_id=NDhJrD0DQT0Z8KRsm62yhxJxqnyPy SKhlhpB8vQ6h9Q7R2BZJGzj!-1089109758!1761676444!7501!-1!434477884!1761676348!7501 !-1!1292098185857
I contacted Samsung support and they said I needed to set the display settings to external display on the mac. I went to the display settings and moved the icon to my status bar. When I click on search for displays or whatever it says (I'm not at my Mac right now) it does nothing.
What am I missing?

I am using MAC OSx 10.5.8 (9L31a) as my operation system. The TV says "No signal. Check connected device's power, cable connection and source selection." Seems to me that that goes in hand with what the Samsung tech said about the Mac needing to be forces to use the external display. But how do I do that?

Ongoing fatal crash and security bug related to connecting external display

The infrastructures in OS X to resume from sleep, to authenticate, and to change displays is fundamentally not working.
The security bug I have encountered has to do with connecting a cinema display exclusively to a MacBook Pro. This is a specific situation, but please note that I have experienced the same problem on no fewer than three independent laptop. Plus, the Genius in the Apple Retail Store was convinced of the general instability of this infrastructure. The security problem is that hot corners no longer function if I transition between two states in the same reboot. The first state is where I have the laptop powered on and using its own internal display exclusively (when I'm on the road). The second state is when I have the laptop displaying its output exclusively on an external display (when I'm at home). What happens is that an attempt to use hot corners fails. There is no response. I even added configuration on all four corners (whereas I originally had settings only for the rightmost corners), and even then, the hot corner action (of sleeping the display or entering locked screen saver mode) does not commence. This prevents the user from being able to secure the display on demand using standard methods that are supposed to work.
The instability level related to connecting the external display exclusively is high. Again, I've experienced this on no fewer than three independent laptops, and the Apple Genius at the Retail Store confirmed that this aspect of OS X did not work consistently. When I want to connect the cinema display to the laptop in such a way that the laptop's own display is not part of the active screen, the process I use succeeds about half the time. Supposing I have been on the road, where I am using the laptop display exclusively. I then put the laptop to sleep. When I return home with the lid open, I connect first the USB (power) from the cinema display to the laptop, and then I connect the Mini DisplayPort. When that step works, what happens is that the login screen shows on the cinema display despite the fact that my laptop lid is closed. This is good, and is what I want. At that point, I open the laptop lid and quickly log in.
With Apple being a mobile device company, I rely on the laptop for tasks that one traditionally may use a desktop for. This simply points to the versatility of the laptop. But I'd like the bugs resolved, so that I do not have to hesitate to make use of the inherent flexibility possible with the MacBook Pro.
Here's what happens when the process (of connecting the external display in a way that establishes itself as the only screen in use by OS X) fails. Firstly, when I connect the external display via Mini DisplayPort, the laptop doesn't even respond. Instead, it remains asleep. So to work around it I have to repeatedly disconnect and reconnect the Mini DisplayPort so that the asleep MacBook Pro will see that there is a display connected to it. Also, sometimes that isn't even enough and I have to open the laptop lid, and put it to sleep again so as to trigger whatever actions are necessary to recognise the external display (presumably by having the laptop recently awake). Around half the time, I have to play this game of disconnecting and reconnecting until it actually works. This high level of reproducibility (confirmed by the Apple Genius representative's confidence that this part of the system doesn't actually work) should make it easy for an engineer to look into the problem.
Fatally, and recently, OS X has completely crashed when I have attempted to connect the external display. The external display has gone completely blue, and after a half a minute, it blanked out and my entire laptop became unresponsive. I called Apple Support and was given a case number. I also took the laptop into the retail store to see if I could recover my current session without rebooting. There was no process suggested to make that happen and I was told to reboot the machine. I've had this happen before on other laptops, and it is frustrating that the kernel reaches such a state that it cannot be used. As I see it, this problem is not too unrelated to the way that I need to play a game in order to get the external display connected exclusively. Here are some workarounds that could be added:
Firstly, whenever I connect an external display, I'd like the laptop to see that this has happened, and to take action accordingly (such as resuming from sleep). Secondly, If I connect an external keyboard, and press a key on it, I'd like this to wake the laptop too (in the event that the first method fails for some unforeseen reason). I'd also like the connection of the cinema display's USB power not to cause the laptop to enter into a confused state between asleep and awake. Sometimes I need to disconnect and reconnect USB power in order to trigger the laptop into waking, but that's only because it's not doing it on its own properly. On the other hand, I also ensure that the laptop doesn't have the Mini DisplayPort connected without also having the cinema display USB power connected, because that also is an unsupported configuration.
I've also gotten the laptop to become confused about whether it is asleep or awake. When I open the lid, it seems to enter into sleep mode, but closing it seems to bring it into an active state.
Also, I've successfully logged on and authenticated with the screen showing exclusively on the external display. But just ten seconds after I start using the system, the laptop falls asleep--with the lid open! Whatever triggers that action doesn't seem to be on track. The laptop is open, there are incoming events such as mouse movements and key presses, and the external display is on and is in use. And then the laptop falls asleep! This has happened numerous times. Not only should this not happen; the instances where it does happen can cause further instability and put my system at risk of fatally crashing.
Also, the authentication system itself is highly buggy--far more than it should be. At times I have opened the laptop lid and caught a glimpse of a window before I have begun the login process. Also, an external authentication application that asks for Kerberos/AFS login credentials has been able to overlay itself on top of the primary authentication (whereas I should only see a single login dialog when I need to authenticate to the system). Also, I've had several of these authentication screens overlay on top of one another, although it's been months since I've experienced that one (so it may have been fixed). Also, around a third of the time, the window that authenticates me (on the black background) somehow transfers itself into the background (even though there's only one window!). What that means is what I begin to type my password, and now the laptop starts beeping at me and I need to manually click on the password field and begin entering my password again. This really shouldn't happen, and indicates too much complexity in this authentication process (such as, more OS X code is involved than is strictly necessary, which is likely to make the authentication system more difficult to test). Also, at times, I have been using too much CPU, such that the authentication screen takes too long to emerge. That also means that I'm not able to logon until I uncleanly shutdown the laptop. If the laptop has been asleep, and is revived in preparation for login, then that login screen should be given highest priority, even if there are other heavy CPU or I/O intensive tasks running in the background. And maybe the login dialog shouldn't disappear when the user is legitimately attempting to log in. So even if there is a possibility that the system is under heavy resource use (or there is a stall or minor deadlock), it shouldn't prevent the user from logging in altogether.
At the moment, the very fact that the system shut down uncleanly means that the full disk encryption suite that I used has entered into an undetermined state, suggesting I may lose access to all my data. It's my hope that I can rely on Apple's products to interoperate in a way that won't cause me to be fearful and restrictive in my use, so that I can freely connect an external display at times, and at other times carry the laptop on the road.

Ive got the same problem with Samsung UE225010 monitor too, its full hd but it looks terrible, could it be Displayport adapter issue, because couple month ago Ive tryed with some IPS display, and it looked same bad.

Can I use 2 external displays on new mid 2011 iMac?

I'm thinking of getting the new 27" iMac with the 2GB video card. It lists in the tech specs two thunderbolt ports and a mini display port, but the images only show the two thunderbolt ports, so I assume Apple is counting one of those as being the dedicated mini display port. I'd like to be able to use an additional two external displays with this iMac, though one extra would be fine. I see on the video card manufacturers website, they say it can "theoretically" drive 6 displays, depending on output ports. Is this like on the Mac Pro tower that can drive 6 displays (3 displays from each video port, assuming you have 2 video cards)? Can the iMac drive 3 displays (internal and two external) off it's video port with the proper adapters, i.e. dual link dvi adapter, or just one extra external monitor? I'd be satisfied with one extra display, but being able to add a 2nd would be a nice help in Photoshop since the iMac doesn't have the anti-glare option like on the laptops. I'd like to keep the second thunderbolt port open for the upcoming thunderbolt raid storage enclosures. Thanks all for any help and information!

Thank you, I have read that I could daisy chain the HD RAID enclosure on one of the thunderbolt ports with another monitor, if the monitor were at the end of the chain, but I do not know if the other port would still simultaneously support yet another external display at the same time.

Connecting iMac Keyboard to Macbook Pro while using iMac as external display

I'm trying to using my iMac wireless keyboad for my macbook pro while my iMac is in external display mode but I can't get the keyboad to connect. I've tried disconnecting the wireless keyboard from my iMac but it won't go into target display mode without the keyboad. Can I used my iMac wireless keyboard with my Macbook pro while my iMac is being used as an external display?

No, not reliably. If it's paired with both machines you can turn it off and turn it back on but it's a toss up which machine it will connect with. If you took it to another room so the iMac didn't see it, you'd have to disconnect the minidisplay port/thunderbolt cable and then it would exit target mode display.

Problem with plazma HDTV as external display

I have Panasonic HDTV 42" , which i use as external display. I try to connect it through miniDVI to HDMI adapter. Sometimes it works just fine. Just turn on tv and macbook use it as external display. But sometimes it does not work. When i turn it on and turn it off, i can see blink in macbook display, so maybe something wrong with TV. It have tried connect to diff HDMI port, connect, disconnect, everything, it does not work anymore. Yesterday, i had the same problem but somehow i fixed it, today i have the same problem. Maybe it is about spaces or ..i just do not know..If someone had the same problem and fixed it , so it would be great to hear suggestion.
Thanks
P.s. Sometimes i got this problem in Windows, but after several rebooting,reseting and reconnection it usually got fixed

Hi!
In the problem i described above i was using: TV->HDMI->DVi-->miniport To DVI-->Mac. However,
I have tried to connect my macbook to normal 22 display using macbook-> miniportToDvi-->ext display. and everything works fine. So i assume that problem is with my HDMI to DVI cable. I will try to find another one tomorrow and it should fix the problem.
Thank you anyway, mate

Qosmio F755-3d150 - Win 7 - no High definition on external display

hello
after instaling windows 7 and the nvidia driver, the external screen dosent display in HD like before,
I tried to configer setting but no resolt,
What driver do i need to install?

In your other thread I read that you have problems installing some drivers.
I guess the issue is related to missing graphic card driver and therefore you are not able to choose higher display resolution for the external display.
But if you have already installed the right graphic card driver, then I would recommend you to check the external display resolution settings.

Use an external display ///

hi guys,
i am about to buy an external display for my old powerbook but i was asking myself if all the menu top bar of all my applications could be controlled from the external display ... u get my point ?
if i ask you that , its because my laptop display is a bit broken at the top , its why i want to use external display ... cause now in all the applications the top menu bar is hidden by the screen bug/crash ... u get it ? ... and i dont wanna pay for an new 17 display , too old model u get my point ...
ty 4 your help guys ...

I use an external display also, but I have a Feb 2007 MBP. I can close my MBP (putting my MBP to sleep thus the external display also turns off) and click my remote or my external mouse or keyboard to wake it up. Since the MBP is closed it automatically sets the external display as primary with all menus. I'm not sure if your older Mac will operate the same way. I hope this gives u a better idea of what decision to make or what else to try or ask before making that decision.
Have Fun!

External display recognised, but no image

Similar Messages

Maybe you are looking for