HT1349 New 27 inch Thunderbolt 2nd monitor not recognized by 27inch imac running windows 7.

I have a 27 inch imac running windows 7 and just purchased a 27 inch Apple thunderbolt display to use as a second monitor. Ive connected the second monitor via a thunderbolt cable however it is not being recongnized by the imac on windows 7. The screen is just black. I've been to the Multiple monitors setup screen in the windows control panel and it does not detect the second monitor. I have boot camp version 5.05033 installed which I installed today. If I run the IOS 10 operating system the second display works OK.
The graphics card is a AMD Radeon HD 6970M card.
I notice that if I have the second monitor plugged into the thunderbolt port the imac will not start up. I have to disconnect the monitor and then the imac will boot up.
I mainly use windows (unfortunately) because I have software that won't run on a MAC so I really need this second monitor to work with Windows.
How can I get the second monitor Thunderbolt display to work on Windows 7.0 ?
Thank you
JB

iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program

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Monitor not recognized by Mac anymore?????

Hi
This is big and what is APPLE doing to solve this issue??
I just copy some posts from the forum to show how big this issue is, there is 8 more pages with the same problem, and i am one of them!!!!
HELP!!!! WE ARE FREAKING OUT HERE AND NEED A SOLUTION!!!
Yes, me. I have an HP w2207 who worked with my 3 y.o. old MacBook (OS 10.4.??) via the DVI-port flawlessly. Then bought a brandnew MacBook Pro with 10.6.X and the external monitor stopped being recognized. It works now that I have changed the connection to the VGA-port of the monitor (and bought yet another adapter for the MacBook Pro) but the quality is not what I'm used to.
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MattLTH
Posts: 15
From: Salt Lake City, UT USA
Registered: Dec 4, 2007
Re: External monitor not recognized!
Posted: Dec 1, 2009 1:29 PM in response to: cruzcj
Reply Email
Yes. I've tried 7 different Macs including a MacBook Pro with Snow Leopard (10.6.2) and my external monitor doesn't work with it either.
For me here's a recap:
Installed SL on a Mac Pro connected to a 23" Cinema via DVI and Olevia 537 via HDMI Input #1 and now that input no longer works with Mac computers.
Reinstalled 10.5.8 on the Mac Pro and HDMI #1 still didn't work, so I plugged the Mac into HDMI #2 and it worked.
Reinstalled SL on the Mac Pro connected to a 23" Cinema via DVI and Olevia 537 via HDMI Input #2 and now that input no longer works with Mac computers.
Since then, every device (PCs, DVD Players, Video Cameras, etc...) I connect to either of the HDMI inputs work fine. However, neither HDMI input works with ANY of the 7 different Macs (regardless of OS version) I've tried, except for a 10-year-old G4 running Panther or Tiger.
The monitor had previously worked with the MacPro (HDMI input #1) and a G5 (HDMI input #2) for almost 2 years.
When I plug the MacPro into any other monitor via HDMI, it works fine. Same thing with the G5.
My theory is still that the installer for Snow Leopard somehow made my monitor's HDMI inputs incompatible with Macs. I'm so frustrated that I'm ready to buy a new monitor, but since there's no guarantee that a new monitor won't be adversely affected by Snow Leopard, I'm still dubious.
Matt
MacPro, MacBook Pro, PowerMac G5 Mac OS X (10.6.2)
Stephen Darling...
Posts: 59
From: London, UK
Registered: Sep 24, 2004
Re: External monitor not recognized!
Posted: Dec 5, 2009 8:22 AM in response to: Roger Kaufmann
Reply Email
Another "me too" post...
Not sure exactly when it stopped working (since I don't use it every day) but my Viewsonic VX2455wm stopped working with my MacBook recently too. Checked with another MacBook (six months newer than my Late 2006 model) and that exhibited the same problem. Both machines have fully patched Snow Leopard installs. Both started with Tiger. Mine is regularly connected to the external monitor, the other has never been connected. I'm connecting using a DVI cable and a mini-DVI-DVI adapter.
The monitor appears to work correctly. I've checked with a Windows laptop connected on the VGA port. I want to test with another DVI-enabled machine to see whether or not its the cable.
MacBook C2D 2Ghz Mac OS X (10.6.2) iPhone
cruzcj
Posts: 4
From: California
Registered: Nov 28, 2009
Re: External monitor not recognized!
Posted: Dec 13, 2009 10:38 PM in response to: Stephen Darling...
Reply Email
My wife's 15" MBP arrived on Wednesday. Connected it tonight to her new Dell 23" ST2310 via a MiniDisplayPort to VGA and it works fine.
MacBook Pro 15" 2.8GHz Mac OS X (10.6.2)
Gaston55
Posts: 4
From: Sweden
Registered: Dec 15, 2009
Re: External monitor not recognized!
Posted: Dec 15, 2009 12:06 AM in response to: Roger Kaufmann
Reply Email
Hi Guys
I have the same problem with my new Dell 2209WAf. It worked fine before i changed from L to SL.
I didn't know what happened so i have spend hours and hours to resolve the problem.
Hours with Mac support and friends didn't change anything, i still cant make my Dell to work, or show up in preferences. I am working as a photographer and this issue is a real problem.
I just heard from Mac Support that Apple is working on it.....well, doesn't help us with the problem today.
So Apple, DO SOMETHING ABOUT THIS! NOW! this problem should NEVER showed up, this is something you should have fixed before telling all the Macers to upgrade!!!
Macbook Pro Mac OS X (10.6.2)
RWildman465
Posts: 2
From: Illinois
Registered: Dec 16, 2009
Re: External monitor not recognized!
Posted: Dec 16, 2009 1:18 PM in response to: Gaston55
Reply Email
Experiencing the same issues. However, on bit different hardware.
I'm using the XLR8 ProView USB input devices. Using these devices on a mixture of 10.5.8 and 10.6.2 systems (2 MacBooks, 2 Mac Mini and 1 iMac).
I can confirm the following:
When attempting to mirror video, or extend the desktop, using a mini-DVI to S-Video/Composite device on OSX 10.6.2 no video is sent to the mini-DVI device (inputing into the XLR8).
When attempting to mirror video, or extend the desktop, using a mini-DVI to S-Video/Composite device on OSX 10.5.8 video is sent to the mini-DVI device (inputing into the XLR8).
Let me also state, that the mini-DVI port on the Mac Mini's do work. They have been connected to 19" monitors and working without issue. Today, the mini-DVI devices were replaced with minidisplay port devices, which are use in conjunction with the mini-DVI ports.
It would appear, in my case, that the problem is that the mini-DVI port on both the MacBook and Mac Mini, running 10.6.2, as a secondary display device is not operating properly.
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Todd Camp
Posts: 2
From: Chicago
Registered: Dec 19, 2009
Re: External monitor not recognized!
Posted: Dec 23, 2009 12:41 PM in response to: RWildman465
Reply Email
Same problems here. I reloaded OS 10.4.6 which is what shipped with my MBP1,2 17" 2.16 Intel Core Duo 2GB ram and after installing that, i was able to select 1920x1080 for my external HP w2338h, DVI-VGA, never been able to connect DVI-HDMI. On SL, the max rez I was able to "use" was 1600x1200 which looked horrible. So this leads me to suspect that this must be an issue with SL.
I spoke with Apple Tech support on Sat and was no help. The only suggestion was that I take my MBP and Monitor to the Apple Store. Those of you who are fortunate enough to live in Chicago in the winter, then you know that option really isn't that feasible, it is but just a giant pain.
Early 2006 MBP 17" Mac OS X (10.6.2)
Salm0n
Posts: 1
From: Minneapolis
Registered: Dec 27, 2009
Re: External monitor not recognized!
Posted: Dec 27, 2009 9:57 AM in response to: Todd Camp
Reply Email
I have an iMac 9,1 Intel Core 2 Duo that I bought last June. It came with Leopard, but I upgraded to Snow Leopard. Currently, it's running 10.6.2. My HP w2207 Widescreen monitor works perfectly with it using the DVI port on the HP and the mini-display (not mini-DVI) port on the iMac.
However, I just bought the top-of-the-line iMac 11,1 Intel Core i5 QuadCore three days ago and it crashes nearly every time that it wakes from "sleep" when the HP w2207 is connected to it. It doesn't even recognize that the w2207 is connected to it. Additionally, when the w2207 is connected, it (a) looks terrible - very dim and very granular, and (b) causes the iMac QuadCore to operate very sluggishly. When I disconnect the HP w2207, the iMac QuadCore is lightning-fast.
Much like my older iMac, the QuadCore is running 10.6.2 and I'm using the mini-display port.
iMac 11,1 & iMac 9,1 Mac OS X (10.6.2)
Marjorie Colletta
Posts: 20
Registered: Mar 17, 2005
Re: External monitor not recognized!
Posted: Jan 6, 2010 6:07 PM in response to: Roger Kaufmann
Reply Email
This is a Me too post, I have a MacBook and NEC Multisync Monitor that worked fine before I upgraded to 10.6.2. I've tried to get it to work without any luck. I've written NEC to see if they have a solution.
MacBook 2 GHz Intel Core 2 Duo Mac OS X (10.6.2)
davej147
Posts: 12
Registered: Jun 1, 2006
Re: External monitor not recognized!
Posted: Jan 11, 2010 6:24 AM in response to: Roger Kaufmann
Reply Email
Another me too post. I have a new 17" MacBook Pro with 10.6.2 installed. Trying to connect to an HPL2245wg - sometimes it works flawlessly - other times not at all. Some mornings I spend 30 -40 minutes rebooting, unplugging and plugging the monitor, Detecting Displays, changing the Graphics Card (Energy settings) - all to no avail. Very, very frustrating Apple - please figure out what is going on with this issue....and get it fixed!
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Anteck
Posts: 2
From: Australia
Registered: Sep 30, 2009
Re: External monitor not recognized!
Posted: Jan 20, 2010 2:31 PM in response to: Roger Kaufmann
Reply Email
Wow, me too. Did a minor software update (apple released it) last night, got on this morning and BANG - my main 24" Dell display is NOT working.
This is ******, apple have surely f**ked up here. It's never had a hitch, ever, since i bought it 9 months ago.
We are all reporting the same thing - software update, and then no working external display...
APPLE???
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Zedog
Posts: 13
Registered: Aug 10, 2006
Re: External monitor not recognized!
Posted: Jan 20, 2010 2:59 PM in response to: Roger Kaufmann
Reply Email
I seem to have found a fix for myself. I was having terrible issues with the screen blinking and flickering constantly. I tried to reset the SMC with everything unplugged and the computer would not reboot at that point on it's own which led me eventually to reinstalling SL.
Reinstalling SL is quite painless actually as it installs on top of your profile. After reinstalling I ran software update which installs the cumulative upgrades. Now I usually don't have any problems but must follow the instructions to run in clamshell mode to the letter.
After a week of running in clamshell mode I started having an issue with the dock not lining up so I put the computer to sleep, disconnected the monitor and restarted with nothing connected. After that, followed the clamshell mode instructions again and have been working fine again all week.
I've also disabled my screen-saver, and deleted the windowserver preferences as part of my debug process but not sure if that has contributed to my new found stability.
http://support.apple.com/kb/HT3131
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pragmaik
Posts: 2
From: Duisburg
Registered: Apr 16, 2008
Re: External monitor not recognized!
Posted: Jan 21, 2010 1:08 AM in response to: Roger Kaufmann
Reply Email
Me too. I have a MacBook Pro 2,2 running the latest Snow Leopard 10.6.2. After I have installed yesterday's security patch it does not recognize external displays on the DVI port any longer. Tried it with a 23" DELL at the office and a 23" Samsung at home. Both have worked without any problems for years.
I am curious to learn how this behavior is related to security...

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HT1349 New 27 inch Thunderbolt 2nd monitor not recognized by 27inch imac running windows 7.

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