External display via Mini DisplayPort to DVI no longer works with MacBook.

I had not used my external monitor in the last several weeks. I believe there have been a few OSX Lion updates since the last time I used the external monitor. I had installed all the updates prior to connecting my external monitor again. However, a few days ago I tried to connect the external monitor and all I get is a "No Signal" message on my external monitor. The Mini DisplayPort to HDMI works on my LCD TV, so I know the MDP works. I have also replaced the MDP-to-DVI cord and the external display still doesn't work.
I connected the external monitor to another computer running Snow Leopard and the external monitor works. So, the external monitor does work.
I have seen a few posts aboout this, but nobody seems to have a solution that works or is directly on point to my issue. I have tried to use all the scenarios for plugging in the external monitor and external monitor power. I tried to reboot the laptop with and withoout the external monitor connected. Same thing with the exteernal monitor plugged in and no power, etc. Nothing works. I have tried to repeatedly turn the external monitor on and off while connected to the MacBook. Again, that doesn't work.
So, I am open to any help someone may have. Here is what I am running:
MacBook, Aluminum 13" Late 2008
OSX 10.7.3
NVIDIA GeForce 9400M

While we all have MacBooks in this forum most of us don’t run Lion. There's a Lion Support Community where everybody has Lion. You should also post this question there to increase your chances of getting an answer. Lion seems to have problems with external monitors. https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion

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Mini DisplayPort to DVI-D adapter works with Mac Mini 2010?

Hi,
I would like to connect my Mac Mini (2010 edition) to both my Samsung PX2370 display and my LCD TV. Currently, I only have the Samsung display connected through the included HDMI-to-DVI adapter, but I'd like to use the HDMI output to directly connect my LCD TV, and connect the Samsung display by using a Mini DisplayPort-to-DVI adapter, like the one that is for sale at the Apple Online Store. Such adapter should work without trouble with any MAc computer that has a mini DisplayPort output, including the Mac Mini, right?
Thanks in advance for your support.

You're right, but I forgot to mention that the Samsung display is just an LCD monitor, so I don´t really need to get audio output for both connections
Currently, I use an HDMI-to-DVI adapter to connect the Samsung monitor, but I'd like to use the HDMI output to connect my LCD TV instead (and probably a home theater system in the future), and use the Mini DisplayPort output for the monitor, so that I can have a dual-display setup.
I asked this question, because I read the description for the Mini DisplayPort-to-DVI adapter in the Mexico Apple Store web page, and that description tells that only Macbooks support the adapter. In the US Apple Store page, it does tell that the adapter is supported by any Apple computer with a Mini DP connection, so I just wanted to confirm which description is true, to avoid confusions.
Anyway, I appreciate that you took the time to respond... Regards!!

Mini-Displayport to DVI adapter not working, but Mini-Displayport to VGA and Thunderbolt work fine

Mini-Displayport to DVI adapter not working, but Mini-Displayport to VGA and Thunderbolt work fine.
This is a brand new MacBook Pro (15-inch, mid-2012) just received. I suspect that this is a hardware problem as:
The mini-displayport to DVI adapter and the external monitor that I am utilizing connect and operate just fine using my older MacBook Pro (mid-2010) with the same OS.
The new MacBook Pro powers the external monitor with a mini-displayport to VGA adapater without issue.
The new MacBook Pro powers an Apple Thunderbolt display without issue.
Both MacBook Pro's are running OSX Lion 10.7.4.
The only combination which does not work is the mini-displayport to DVI adapater used in conjunction with the brand new MacBook Pro (mid-2012).
All adapters and components (mini-displayport adapters) are Apple retail adapter.
I have tried several external monitors, including my Dell U2412m.
When I connect the mini-displayport to DVI adapater to the new MacBook Pro (mid-2012), nothing happens. The external monitor reports "no signal" and attempts to go into sleep mode. Using the "Detect displays" button has no effect, even when used multiple times. Rebooting does not help, nor does resetting the SMC or PRAM.
Any other suggestions before I take it to the Genius Bar?

I turns out that the logic board of my MacBook Pro was faulty (despite being brand new).
I took it to the Apple Store, presented the problem, and one of the Tech's came to the same conclusion that I had -- hardware failure. Phone support was no help in the matter (and even told me that what I was trying to do wasn't a supported option, which is rediculous). However, the Genius Bar did take care of the problem, and my MacBook Pro was back to me with a replaced logic board within a few days.
Hope that htis helps.

Trouble with 30" HD Cinema Display using Mini DisplayPort to DVI Adapter

I bought a new MacBook Pro and I am having trouble getting the full resolution to work with my 30" HD Cinema Display (purchased in 2007 max resolution 2560 x 1600) using a Mini DisplayPort to DVI Adapter.
According to the specs page, http://support.apple.com/kb/SP581 , the max resolution of the HD external display is supported. Unfortunately the max that I can set it to is: 1280 x 800
Has anyone else had the same issue?
If this isn't resolved I'm likely going to exchange my MacBook Pro for one that can support this display.

So I went and bought the Mini DisplayPort To Dual-Link DVI Adapter as suggested and it seems to work great.
Now the problem that I have is when I open up Apple's DVD player, the screen is blank but I can still hear audio.
If I unplug the display, the movie will display properly. Rebooting with the display plugged in doesn't help either. I also deleted all the DVD players enc setting files so that they would re-initialize but no luck.
Any idea what this problem might be??
Chipset Model: NVIDIA GeForce GT 330M
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0a29
Revision ID: 0x00a2
ROM Revision: 3532
gMux Version: 1.9.22
Displays:
Color LCD:
Resolution: 1920 x 1200
Pixel Depth: 32-Bit Color (ARGB8888)
Mirror: Off
Online: Yes
Built-In: Yes
Cinema HD:
Resolution: 2560 x 1600
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Adapter Type: Mini DisplayPort To Dual-Link DVI Adapter
Adapter Firmware Version: 1.03

27: iMac Apple Mini DisplayPort to DVI adapter quits working post-firmware

I iMac Apple Mini DisplayPort to DVI adapter suddenly quit working after I installed Apple's latest iMac display firmware update. This is an Intel Core i5; the monitor is an LG Flatron 24" Wide, and when it powers up it says "no video input" and goes into power-saving mode. No amount of replugging cables helps, but the monitor works fine on other computers.
The Displays control panel just shows one monitor, and clicking Detect Displays does nothing.
I suspect Apple's Display Firmware Update. My installer log shows the following, but the problem only happened today after the latest update:
6/1/10 9:45 AM 27-inch iMac EFI Firmware Update 1.0
6/1/10 9:45 AM 27-inch iMac Display Update 1.0
6/4/10 11:47 AM 27-inch iMac SMC Firmware Update 1.0
6/4/10 11:47 AM 27-inch iMac Display Update 1.0
6/5/10 7:29 AM 27-inch iMac Display Update 1.0
I have automatic updates disabled, but after each update I would see more firmware updates ready, but caution leads me to never install more than one of these at a time, and then to wait a while to see if anything bad happens. The odd thing is that the Display Update 1.0 seems to have been installed three times in this course of events. Alas, there appears to be no way to uninstall a firmware update.
Here is the System Profiler Graphics/Displays output:
Chipset Model: ATI Radeon HD 4850
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x944a
Revision ID: 0x0000
ROM Revision: 113-B9110C-425
EFI Driver Version: 01.00.383
Displays:
iMac:
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort
Display Connector:
Status: No Display Connected
It says the Mac sees no display connected, and the display gets no video signal. Since the adapter is an active device (it has powered electronics to convert DisplayPort signals to DVI signals) I suppose it could have just coincidentally died. But that seems unlikely given that the thing worked perfectly just before the last firmware update.
Does anybody have similar experience, or better yet, a fix?

Unfortunately the Apple Knowledge Base does not give much information about this update. Such has how to tell if it has been successfully installed. I suspect that because it keeps recurring in the install log that it has not been installed successfully as yet. Are you receiving this update through Software Update? Can you locate the installer for this update? It maybe located in Apps/Utilities.
Some firmware update installations can be interrupted/corrupted by attached devices. If you find the update's installer on your iMac, I suggest that you detach all external devices from the iMac, use an Apple USB keyboard & mouse if available, follow the instructions carefully and install the update manually. If you do not locate the installer I suggest downloading manually from the link below and installing it.
The Knowledge Base article mentions that your iMac should also have a Graphics Firmware Update. I suggest that you download and install that as well.
27-inch iMac Display Firmware Update 1.0
http://support.apple.com/kb/DL998
27-inch iMac Graphics Firmware Update 1.0
http://support.apple.com/kb/DL984
Dah•veed

Mini displayport to dvi adapter not working

hello,
I have both a 2008 Mac Pro tower with 2 Apple Cinema Displays, and a newer MacBook Pro that I'd like to hook up to one of the monitors.
The 2 monitors are both DVI, so I bought a mini displayport adapter to plug into the thunderbold port on the MacBook Pro and the other end to the monitor.
When I plug it all in, I get no video on the monitor. I am sure the monitor works, I'm sure the cables work (from the monitor), not sure about the adapter (I just bought it, so it could be bad)....
I did see quite a bit of the same issue online, thought I couldn't find any help in fixing it.... short of driving back to the apple store and replacing the adapter, I'm wondering if there's anything else I should do to trouble shoot this....
I've restarted the computer, checked all connections, nada....
help??

The problem was simple: my laptop wasn't plugged in...
The desk where the Mac Pro is isn't where I typically use my laptop, so I carried the laptop over and plugged the monitor in, when that didn't work I looked online and checked here- I also returend the original adapter to the apple store. I inquired about it there, and the genius asked if my laptop was plugged in when I tried it out... sooo when I got home I tried it again with the new adapter and with the laptop plugged in, and it worked right off the bat with no trouble shooting or "detect display" necessary...
The laptop must be plugged in for the external monitor to show up...
now I know.

Using external Display via Mini-DVI to VGA Adapter does'nt work

Hey Guys,
i recently bought a mini-dvi-to-vga adapter.
When I plug it into my macbook and connect it to my 19" external TFT, the MB recognizes the TFT as [Medion] MD30219PH but the display stays blank (no matter if i choose mirroring mode or extended desktop)...
Already changed the Hz-Rate between 59.9, 60 and 75 Hertz and the Resolution also... but nothing happens.
In extended Desktop mode i can even slide the cursor into the area where the display is supposed to be...
Hope u can help me
thx

From what I've been told, using the computer's video output isn't outputting a true NTSC picture. I was told when talking about how the Macbook Pros dropped the S-vdieo port that I shouldn't use that anyways, but rather to go the firewire route. THat was actually converts the video source to true NTSC instead of taking a computer output to a TV. While I have no doubt that it works, I'm willing to bet that you'll see a noticeable difference between the G5 S-video and your MB using firewire. Most consumer camcorders from the past several years do digital (firewire) to analogue (NTSC) conversion, so you probably don't even need a new box.
-Brian

HT3913 Can I connect a Sony TV 32 inch to my late 2009 iMac as an external display using Mini DisplayPort to HDMI?

Seems doable--can I?

Hello, All-
I too am very interested in the answer to this query. Same set up, same fail w/the Thunderbolt cable. The Genius Bar at the Apple Store was no help & recommended I bring my 27" iMac into the store...seriously? Their ultimate answer was that I needed a plain old male-male mini display port cable....that the Thunderbolt cable was the problem. Bloody unlikely, I say. Another guy in the store agreed with me this morning, so swapped out the cable. I was hoping upon hope it was a bad cable, but no such luck—still nothing. Next I tried a mini-display-port-to-DVI adapter—DVI cable—mini-display-port-to-DVI adapter. This also did not work. Is there a chance that the iMac running Snow Leopard and the MacBook running Mountain Lion is the problem???

Mbp 15 external display via mini display to hdmi flicker

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While we all have MacBooks in this forum most of us don’t run Lion. There's a Lion Support Community where everybody has Lion. You should also post this question there to increase your chances of getting an answer. Lion seems to have problems with external monitors. https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion

La Cie Porsche Design External Hard Drive no longer working with Time Machine since update to Yosemite.

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Can you see the drive in Disk Utility? If so, try selecting it and using the Mount button in the top menu. You can also run repair disk and repair permissions.

Macbook can't detect external display via DVI cable

I just bought Samsung PX2370 monitor and attempt to connect it with my Macbook Aluminum (late 2008). I have mini display port to DVI adapter and DVI cable. When I hook up my Mac, nothing comes up. The screen on macbook goes blue briefly and then back to normal, but nothing has been detected. I've manually set the source of signal to DVI, and tried to use Detect Display but nothing happens. Even I try to detect the monitor by using Windows 7 (via bootcamp), the display remains idle.
I had tested the monitor using DSLR although by HDMI, it work.
Any help would be much appreciated.

Hey hparekh and welcome to the forum -
It looks like you have the correct hardware. You should check your connections... make sure your using the Mini DisplayPort and not the Ethernet port (common mistake) and all of the connections are plugged completely. Make all of your connections with your MacBook on and then turn your Dell on. You might need to go through your Dell's setup to make sure that it's recognizing a DVI input rather then HDMI.
Might be a bad DVI cable or a defective monitor or maybe a bad Mini DisplayPort to DVI adapter. Are they all new products?

Mini DisplayPort to DVI + DVI to VGA Display Adapter, will it work?

Hi,
I have a MBP, and I have just purchased an apple Mini DisplayPort to DVI adapter.
I want to connect it to a VGA port.
Can I buy an Apple DVI to VGA Display Adapter and connect it to the connector above.
Will that work? Any one with experience who could advise me on that?
Thanks.

This does not work, because the Mini DisplayPort to DVI adapter has a DVI-D port that transmits only digital signals. VGA uses analog signals.

Hi I have a recent macbook pro 12" (bought in april 2012) model number A1278. I'm trying to connect to a 23" apple cinema display (A1082) this currently is not working - i've bought an additional Apple MB570ZA Mini DisplayPort to DVI Adapter - no luck!

Hi I have a recent macbook pro 12" (bought in april 2012) model number A1278. I'm trying to connect to a 23" apple cinema display (A1082) this currently is not working - i've bought an additional Apple MB570ZA Mini DisplayPort to DVI Adapter - no luck!
im not sure what to do next - can anyone help?
im running OSX 10.7.4

Hi There,
I have had the exact same issue but with a projector.
The issue lies with Mountian Lion 10.8.2.
I tried many a combination with no luck to get HDMI working.
Took my mac into the apple store and came to the conclusion it was the software, so I asked them to install 10.8 onto it (this is destructive so a backup is a must)
Bought my macbook home and voila, now displaying through my projector.
There is a small graphics update after 10.8.1 which seems to be the cause.
Hope this helps.
Thanks.

Mini DisplayPort to DVI not working, No Multi-Monitor, Jerky Mouse

I have an iMac, 27 inch, 2009 model.
Until today I've had a second monitor attached via the Mini DisplayPort to DVI adapter. The monitor is a Samsung SyncMaster T260. This setup has worked perfectly well so far.
Until today that is. Now the monitor is not recognised any more and if I try to select "Detect Displays" the mouse pointer hangs every few seconds - stops dead and then restarts again.
What did I do to make this happen? Nothing (that i'm aware of). Haven't installed anything, not done a software update, just literally rebooted and it's not working anymore.
_*Things that still work...*_
The Mini DisplayPort to DVI adapter works on a Mac Mini, so that's OK
The DVI cable works fine when plugged into a PC or Mac Mini, so that's OK
The Monitor works fine when plugged into a PC or Mac Mini, via DVI, HDMI or VGA, so that's OK
So I've established that, in isolation, each part of the system is functioning perfectly well.
*_Things I have tried - without success..._*
1) Rebooting - both iMac and monitor
2) Unplugging all cables and reconnecting then rebooting again
3) Clearing the PRAM - done it twice just to make sure
4) Updated to OS X 10.6.7
5) Reset the SMC
6) Deleted the com.apple.windowserver.plist files at /Library and ~/Library
7) Googled for solutions - plenty of people seem to have one or the other of these symptoms...
Can anyone shed any light on what's happened here ? Please help!
Cheers
Mart
** Sorry if this is in the wrong place, I just found a forum specifically for the iMac so posted it there but not sure how to delete this one. **

Well, it would be interesting if that's when it had occurred. At the time, I hadn't installed 10.6.7, and hadn't installed anything immediately prior to the problem occurring.
It doesn't seem like there's any way (a-la System Files Checker on Windows) of checking the integrity of system files which may have been corrupted, nor a way of reinstalling any update in the case of this happening - or is there a way of doing this? You don't seem to have any control over updates apart from applying them - if something does go wrong, there's no way of backing out. I guess Time Machine is the answer to my own question there.
I'm happy that it's working now, but it was a pretty extreme fix to have to wipe the entire system. At least it wasn't a hardware issue, I'll be thankful for that!

Mini Displayport to DVI working in Bootcamp but not in Leopard

I've got a new unibody MBP together with a mini displayport to dvi adapter.
When I connected the dvi cable with the MDP2DVI adapter to my new MBP and my 3-months-old Benq 20" LCD monitor, nothing shown up no matter how I tried. The monitor just kept saying no signal could be detected.
Being frustrated so I did some googling, and I'm surprised by the vast number of people who have got problems with the external display!! I really didn't notice this before I decided to buy this MBP and I'm a little regretted, coz the 2nd monitor is so essential to the productivity of my work...
After searching around for a solution for some time, I am pessimistic of waiting for a solution from apple as I see some people had already address this issue in late 2008 but till now seems no solution had came out.
Last night when I use bootcamp to enter Windows XP, surprisingly it can recognize my external display!!! So now I am quite sure that it's the problem of Leopard but not the display hardware nor the adapter nor my monitor/cable. Did anybody have the similar problem as me tried this in bootcamp??

keepyourpower,
For what its worth I've been having much the same issue with my Macbook Pro. Leopard will refuse to see the external display while Windows Vista on bootcamp 90% of the time will but not without some effort. I've been able to get Leopard to use the display after going in to Windows and manually selecting display attached in the display properties menu. It doesn't always work but it will sometimes.
I'm 100% sure there is a flaw in the logicboard on some of the 2.4 Ghz that is causing this issue. I recently sent my portable in for repairs and they replaced the display which is why it was in and the Logicboard. I'm not sure why they replaced my Logicboard nothing was wrong with it, but with the new one its having much the same problem as you. As I said before I'm 100% sure this is a hardware defect in the Logic Board and if you are within your 14 day return window I'd see about asking your local Apple store to exchange the unit for a new one.
Not really sure if this will help you at all but didn't want you to think you were alone with this issue..

External display via Mini DisplayPort to DVI no longer works with MacBook.

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