Mac Pro :: Unable To Use Dual Monitors / No Signal On Both DVI Channels

Jan 10, 2009

After lots and lots of reading I went for flashed Sapphire 4870 512 off eBay for my Mac Pro 1,1 running SL 10.6.2, with two Viewsonic VP2030b. The guy selling the card had sold flashed cards before and had 100% feedback, said the card worked with dual monitors and supported SL. Got the card, installed it without a problem, but could not get it to work with both monitors.

Second monitor said no signal on both DVI channels. Checked all the wires, reinstalled, rebooted, no luck. Plugged both into my 7300GT, no issues at all. At one point, I got the left monitor to boot as the extended desktop, showing the dock but not showing the HDD or icons (which should be on the right screen), but the right screen still showed no signal and was black. Used the gather windows botton in the display preferences to see if adjusting settings helped, still nothing. Detect displays button was no help either. Is this a compatibility problem on my end or a flashing problem on his? Contacted him and he said he had no issues with his MP 1,1 and two 20" Apple displays.

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Hardware :: Unable To Use Dual Monitors / DVI (female) Connected To VGA (male) Adapter

Sep 5, 2009

I've been trying to connect my MacBook to my Dell monitor. So, first I bought a mini DVI-VGA cord, but realized that I had a DVI not an AVI connection. In order to save time and money, I bought a DVI (female)-VGA (male) adapter. Everything fits in and connects perfectly. The problem is: when I turn on my Dell monitor nothing shows up. It says it's on safe mode and all I have to do is press a key on the keyboard or move my mouse. I do that, but it doesn't detect anything.

I know my laptop detects the monitor because when I go to display --> arrangement, I see there are 2 screens and display --> Gather Windows, a window for the Dell does pop up. From my understanding that once you plug in all the cords from your Mac to your monitor, it should work right away. So whats wrong with my dual screen? And how can I get it working?

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MacBook :: Dual Dvi Monitors With Dvi Splitter?

Mar 11, 2010

I have a macbook 2006 model with the mini-dvi connector. It has snow leopoard installed. I plugged in 1 external monitor and it displays 1680x1050 resolution on that monitor which is perfect. What can I expect if I split that DVI output with a DVI splitter to two monitors?

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MacBook Pro :: Signal Degradation With Dual-Link DP-DVI Adapter?

Sep 30, 2010

When I connect a display via a Dual-Link adapter (tested original Apple and Dr.Bott) to the external Mini-Displayport of my Macbook Pro 17" 2009 I don't get full 8 bit per channel color depth (or at least it's seriously messed up with heavy banding), neither in native resolution (2560x1600) nor in non-native (1920x1200).Running the same display via the same cable over a passive Single-Link adapter works perfectly well (all 256 shades of grey present).

I tried two different cables (both a Dual-Link and a Single-Link cable, both of which work with the Single-Link adapter). So either both Adapters are bugged the very same, or the 9600M GT does something wrong when a Dual-Link adapter is connected. It could also be a driver issue, but at least the internal display doesn't show any banding when running in Clone mode.Same happens on OS X with both the 9600M and 9400M. So either both adapters ain't working properly or there's something wrong with the combination of NVidia 9x00M and Dual-Link DVI.

And I tested three more single-link displays (1x 1920x1200, 2x 1680x1050) and only one works (the 1920x1200 Viewsonic VP2330), the other two show the same problem with both Mini-Displayport to Dual-Link DVI adapters.Then I tested connecting a current ATI based IMac 21.5" to one of the not working displays (a Samsung) and there worked with both adapters.So it seems that the 9400/9600M in the Macbook Pro output a signal of lower strength (compared to the ATI based Imac), which leads to signal degradation once coupled with a Dual-Link adapter. The reason why the VP2330 works probably is because it can work with weaker signals. That doesn't help me at all with my 30" display though and only 1 working display out of 4 is rather disappointing.

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MacBook Pro :: Connecting Dual Monitors / Usb Monitor Adapters Or DVI Connections

Sep 7, 2009

I have a new 2010 MBP and I'd like to hook up two external monitors to it, more specifically, two ASUS VW246H 24-Inch Widescreen LCD Monitors. Either via HDMI or DVI connections. I've found various usb monitor adapters, but i've read that many can't quite 'keep up' and I really can't seem to find a solid solution out there.
So does anyone have a dual monitor setup they currently use, if so, what are you using to connect the mini display port to both external monitors.

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Mac Pro :: Unable To Work With 4870 Dual Monitors

Jun 16, 2010

I have an issue with my 4870 (Mac edition) that has been occurring since day one (when I purchased it last month), but it's not something that happens every single time.

I've run into a problem that the 4870 has trouble recognizing one or both monitors plugged in. If I shut off power to my displayport-connected main monitor, it'll throw the menu bar, all the desktop items, and application windows onto the second monitor (DVI-connected). This also happens when I shut off the second monitor (desktop items and app windows get shuffled to the main monitor).

The other issue is that on startup, it may just be slow to recognize one of them, and the above screen-swapping issues happen anyway, followed seconds later by the screen once again being recognized.

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Hardware :: Two Monitors Via Dual-link Dvi Adapter?

Sep 11, 2009

With a minidisplayport to dual link dvi adapter and a dual link dvi splitter, shouldn't I be able to connect to monitors to one of the new macbook pros?

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Hardware :: MBP: Dual DVI Monitors/DisplayLink Inconsistent?

Aug 11, 2010

All, I'm a complete Mac newbie, just made the switch from Windows, so I apologize if similar topics have been discussed a million times, but I've been unable to find an answer to my specific issue.

I recently purchased a 13" MBP (OS X 10.6.4), and have dual 22" Acer monitors that I prefer to use when at my desk (I close the MBP and use an external keyboard/mouse). I have the Apple mini DP to DVI connector, which works fine for driving the first monitor, then I have a generic (bought on ebay) DVI to USB connector that was working for about 2 weeks, now it no longer does. It runs off of the DisplayLink 1.6.2 beta driver (1.5 wouldn't work). The first time I simply installed the driver, had the MBP open, then plugged in the USB connection and it was detected. I then closed the MBP, and would then put the MBP to sleep, return and it would still recognize it. This time I shut down the MBP, returned and it doesn't recognize the monitor.

I've tried everything I can think of, from uninstalling/reinstalling the driver, to keeping the MBP open in hopes of it recognizing the second monitor, but no luck.

I'm trying to avoid shelling out for a Matrox device, but even then I'm not convinced that it will work. I'm assuming it's a driver issue, so I'm trying to also avoid anything that requires using a driver, but of course everything seems to use the same DisplayLink driver.

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Mac Pro :: 4870 Unable To Recognize Dual Monitors / Display Not Giving

Sep 3, 2010

I have an issue with my 4870 (Mac edition) that has been occurring since day one (when I purchased it last month), but it's not something that happens every single time.

I've run into a problem that the 4870 has trouble recognizing one or both monitors plugged in. If I shut off power to my displayport-connected main monitor, it'll throw the menu bar, all the desktop items, and application windows onto the second monitor (DVI-connected). This also happens when I shut off the second monitor (desktop items and app windows get shuffled to the main monitor).

The other issue is that on startup, it may just be slow to recognize one of them, and the above screen-swapping issues happen anyway, followed seconds later by the screen once again being recognized.

Has anybody else faced this issue? Is there something that can be done? This shouldn't be happening, right?

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Mac Pro :: Connect Single Dvi - I Into Dual Link Dvi - I?

Mar 25, 2009

I'm thinking about buying the mac pro 2.26GHz model and it comes with the nvidia gt120 card. Anyways, I noticed that it has 1 mini displayport and 1 dual link dvi port. My question is, can I connect a regular dvi-i into the dual link dvi port?

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Applications :: EyeTV - Some Channels Say No Signal, But Other Devices Work Fine

Jan 3, 2010

I have Elgato EyeTV Digital TV Recorder Version 2.5.3 (3313) running under OSX version 10.4.11 and using a Miglia TVMini (TVM01) USB 2.0 DVB-T Digital Video Recorder device.

Recently, (after no software changes except maybe a osx/safari/itunes update, but I can't imagine why this would cause a problem), certain channels now display "No Signal", and when I check the preferences Signal info, these channels have a strength and quality of 0%. This seemed to happen all of a sudden, and I now cannot get the channels working again (despite trying a signal booster, re-scanning all channels) while other receivers (i.e. a TV) seem to work fine from the same input.

A full listing of the channel titles (and numbers) which are displayed as having 0% strength and quality are: Yesterday (12), 4music (18), Film4 (15), Viva (21), Ideal World (22), ITV4 (24), Dave ja vu (35), Big Deal (32), Virgin+1 (35), Create & Craft (36), Rocks & Co (40), Lottery Xtra (45) Russia Today (85), smileTV2 (94), Babestation (96), Babestation2 (99).

how to get these channels back working again?

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Mac Pro :: 6GB Versus 8GB Triple Versus Dual Channels/PS4 Tests

Jun 30, 2009

I ran some tests on my 2009 Quad Nehalem to try and determine what was up with the triple Vs dual memory "brouhaha".

I posted the results as a new thread because I think it will be useful information for a lot of quad owners, but it was originally going to be a reply to this thread: http://forums.macrumors.com/showthread.php?t=735845

Here we go. Tesselator suggested 3 tests that could show the differences in speed between triple and dual channel bandwidth.

Quote:

As one idea I would maybe try creating a few very large images (16-bit, blank white, blank black, gradient fill) and then duplicating and deleting that layer repeatedly a few hundred times.

So I did them, 10 times each. I could have gone on, but the results were very very stable after the first 2 attempts.

Set-up: a 40Mpx, 16bit image (8000*5000). First test it was simply filled white; second test: black; and third test a black to white gradient. I added a fourth test, using a real (photo) 12Mpx RAW image from my Nikon D300.

I created (took a while!) an action with 350 repetitions of "duplicate layer" and "delete layer", followed by a red fill to let me know the action was done. The same action was used in all four tests.

The computer was restarted before each of the four tests, which may explain the irregularities on the first 1-2 attempts. Nothing else but PS4 was launched.

The results are interesting:

We can clearly see that the simple white and black fills show a speed difference of around 10%.

We can also clearly see that this difference disappears when a more complex image is used. The use of more complex images represents a much more realistical use of PS.

To make things even more realistic, I also tested RetouchActions's speed test on my own 12Mpx image. I use nearly all of the operations of that action on a daily basis, so it's a lot more representative of the work I do on PS.

Here are the results:

The results are clear: 11% increase in performance using 8GB of ram (Vs 6GB) when working on a 12Mpx image.

Added info: number of page-outs after running the 10 test series (after about 45 minutes of intense PS work):
-17K when using 6GB (1.7K page-out avg).
-10K when using 8GB (1K page-out avg).

For me the results are definitive: unless I plan on working only with full black or full white images (not even black and white!), having 8GB is better, even when working on smallish 12Mpx files. I imagine the differences would have been even greater using bigger file sizes of actual complex images.

What would now be interesting: someone with a 2009MP Octo doing the same tests at 12GB and 16GB.

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Mac Pro :: Mixing VGA And DVI Monitors With 5770?

May 26, 2012

I've seen the Apple articles and the forum posts about this, but before I need to check my configuration will work before it has to be used on a show at work (the MP is running screens in a venue). I've seen lots of scenarios with people using all DVI monitors or all VGA, but can't find any examples where they are mixed. 

Here is my proposed setup: 

DVI output - 800 x 600 - First device (DVI input only)

Mini Display Port 1 - also 800 x 600 - Second device (DVI/VGA input but strongly prefer to use DVI) via Mini Display Port -> DVI adapter (passive?)Mini Display Port 2 - 1376 x 7?? - Monitor running the UI (VGA input) via Mini Display Port -> VGA adapter (active?) My worry is that there is only one active adapter in the system? If this won't work, I have two backup plans, which I would also like to know if it will work or not, please. One of the DVI devices has a buffered DVI link out, so I could use that to feed the other DVI device. So Backup plan 1: DVI output - 800 x 600 - DVI in of first device Mini Display Port 1 - 1376 x 7?? - Monitor running the UI (VGA input) via Mini Display Port -> VGA adapter (active?) MDP 2 not used. 

Backup plan 2: 

DVI output - 800 x 600 - DVI in of first device

Mini Display Port 1 - also 800 x 600 - Second device, VGA input via Mini Display Port -> VGA adapter

Mini Display Port 2 - 1376 x 7?? - Monitor running the UI (VGA input) via Mini Display Port -> VGA adapter 

Info:
Mac Pro, Mac OS X (10.7.4)

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Mac Pro :: Connecting Two 24' Monitors / Requires Display Port Dvi Adapter

Jul 28, 2010

I am about to purchase a Mac Pro and I want to connect two monitors (dell2408wfp).I am confused if I need to buy the displayport dvi adapter or not, does the ati card have two dvi ports? I have been reading mixed things on different sites about requiring two graphics cards for multiple displays etc.

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Mac Pro :: How To Setup Dual Monitors

Mar 2, 2012

how to setup dual monitors. I have a 2009 Mac Pro with a ATI Radeon HD 4870. I dont see the options in the Display settings. Also I I get nothing on the second monitor?

Info:
Mac Pro, Mac OS X (10.7.3)

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Mac Pro :: Using Dual 24" 1920x1200 Monitors

May 15, 2008

I have the setup in my sig and I'm running one Dell 24" at 1920x1200. The thing is that I'm considering getting another monitor exactly the same so I can run dual monitors, but I've read that some people have had some lock-up issues while attempting this. My question is who wide spread is this before I go and drop $600 on another monitor?

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Mac Pro :: 1.1 - 7300GT - SL Dual DVI

Aug 30, 2009

I'm running a MacPro 1.1 with a 7300GT. I have two 24" monitor plugged on each DVI output of the card. Eveything worked well in leopard. I tried Snow leopard with the same setup, and there is no way to have both monitor working. No signals reaches the second screen. Worst, once boot... If I run the "screen detection", both DVI signals are stopped. SL seems the both screen, I can see them in the system configuration. Both are stated as "connected", I can even "move" windows on the second screen but of course this is useless cause there is no signal. Anyone here having the same problem ? any idea to fix it?

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Mac Pro :: How To Extend The Desktop Screen With Dual Monitors

Mar 6, 2008

Having a hard time figuring out how to extend a panoramic background image across two monitors.

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Mac Pro :: GeForce 6600 LE Support Dual Monitors?

Aug 28, 2009

does the GeForce 6600 LE support dual monitors?

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Mac Pro :: Dual Monitors And One Of Them Does Not Look As Nice Same Colors As Opposite

Mar 12, 2010

I have the above listed graphics card in my 2008 mac pro 8core with 6GB of ram. I am wondering a few things

A. I have dual monitors and one of them does not look as nice and the same colors as the opposite. They booth are on the same settings and same color profile. So i am wondering if the monitor is bad or the graphics card possibly?

B. If i wanted to upgrade and not spend a ton of cash what would you recommend. My screen are capable HDMI and i have 2 so please keep that in mind.

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Mac Pro :: Bypass Dual-link DVI?

Jun 2, 2008

got a problem with my Optoma projektor, since i?m using a OPPO HM-31 hdmi switch that doesn?t support Dual-link DVI, so my macpro can?t display anything and just keep switching between desktop and blue screen. I?m connectting from 2600xt via dvi-hdmi through a hdmi cable. Without the switch there?s no problem.

Q: Is it possible to by bypass Dual-link DVI, so that my hdmi-switch only receives a Single-link DVI signal?

Macpro:
octo 2.8 w, 2600xt, 20" ACD

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Mac Pro :: 8800 GT Dual Monitors Don't Fit?

Mar 4, 2008

So I was using my second monitor to run my G5 while transferring files to my new 3.2 octo, and then the past week I was using it to transfer my old PC files to my new PC. Now I finally just went to hook it up as my second monitor on my Mac Pro, and found out that I CAN'T FIT BOTH DVI CABLES TO THE PORTS!!!

They're too close together so I can fit one monitor into either port, but not both simultaneously. My monitors are the aluminum 23" ACD's w/ DVI.

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Mac Pro :: Using Dual Monitors / Screen Makes Blue Flashes?

May 15, 2008

I just hooked up a 2nd monitor to my early '08 Mac Pro and when in OSX the screens start to go blank/blue for about 1 second intervals. They flash together sometimes, and other times sort of independantly to each other. When the desktop comes back on it fades in like its animated rather than like its cutting in and out.

It seems fine when I disconnect one monitor.Running 10.5.2 all updates 8 core 2.8ghz with 10gb ram and 8800GT

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Mac Pro :: Updating To 10.6.3 - Now Dual Monitors Don't Work?

Mar 29, 2010

I have a Mac Pro 1,1 with a flashed ATI Radeon HD 4870 XFX. Had no problems with it ever.

Installed Mac OS X 10.6.3 software update and now the second monitor says No Input detected. Switched second monitor to first monitor and it worked fine, but the second DVI port no longer works.

Need to get this figured ASAP as I have a lot of work to do today... very unhappy with this update. Anyone else having a similar issue or have any thoughts on what to try? I've done everything I can think of.

Do I need to flash it again? Seems silly to have to flash it every time you update the OS. The video card is still recognized in System Profiler. HD 4870 with 1GB GDDDR5 VRAM.

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Mac Pro :: Dual Monitors - Separate Screen Saver Settings

May 8, 2012

I've got dual monitors up and running for the first time. With my workflow, I'll be working at one monitor for several hours and then the other for several hours. I'd like to have independent screen savers for each monitor so the one not being used won't get burn in, etc., but I don't see any way to do that.  

Perhaps I'm answering my own question here, but I would suppose that if I'm in extended mode (which I'll be doing) it's really just one big screen, so there isn't a way to tell the other screen to start running a screen saver....and if I'm mirroring, they're both doing exactly the same thing. Those pieces of logic tell me that I can't do what I want to do.  

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Mac Pro :: Flickering On Dual Link Dvi Adapter?

Apr 14, 2009

I have a 8x2.93 with 2 x 30" apple displays & the ati 4870.I have the displayport to dual-link dvi adapter to use both monitors.The monitor connected to the dvi port on the card is fine.The monitor connected via the adapter occasionally 'flickers' or kinda turns on/off very quickly.It's very intermittent. Often will go hours without doing it, but regularly does it 3-5 times a day.

I've tried swapping monitors around, and the problem follows the adapter.I've also got a 2nd adapter here spare (that I sometimes use for my laptop) that I swapped in as a test and the same happens.Smells to me like a firmware bug.I rang apple and amusingly they told me to run the vga firmware update. I told them it was not vga and they told me I still needed to run it. When I ran it of course the updating program said "no vga displays connected". Real smart advice there. They are looking into it and said they might be 5 days.

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Mac Pro :: Flashed 4870 With Dual-DVI Support?

Jun 6, 2009

I recently flashed my Sapphire 4870 1gb card and haven't been able to get dual monitor support working in Mac OS. Has anyone been able to get this working on a Sapphire 4870?

It works fine in Windows, not sure why it wont work in MacOS as I imagine the 10.5.7 drivers should be doing all the work.

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Mac Pro :: Get Sound From Dual Link Dvi Cable?

Feb 19, 2012

I just bought a Dual Link DVI to HDMI cable. From what I know I will be able to get sound out of of this set up. However, I cannot fingure out how to get sound via HDMI.  

There is no such option when I went to sound preference, unline when I was using a minidisplay port to HDMI adapter where I could hear sound on my HDTV via HDMI.  

If I could get sound out of dual link dvi to hdmi cable, what do I need to do in order to get the sound working via HDMI instead of Analog Line Out.  

I was frustrated because the minidisplay port/adapter does not work for bootcamp, so I went out and bought dual link dvi to hdmi cable instead. Graphic is as great as HDMI, but I could not figure out how to get the sound via hdmi while using this setup.   

Info:
Mac Pro, Mac OS X (10.6.8), 12 Cores, 8 GB DDR3 Ram, Dual 5770

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Mac Mini :: Unable To Get Dual Displays / Using Mini DVI And Mini DisplayPorts

Sep 12, 2010

I have an Early 2009 Mac Mini with Mini DVI and Mini DisplayPort. And I have two 1080p HDTVs. The Mac Mini is capable of dual display, and I've gotten it to work before, so the issue is not the TV or Mac. And I have tried both Mirroring and No Mirroring.

I got a Mini DisplayPort to HDMI Adapter (#5311) and a Mini-DVI to HDMI Adapter (#4852) both from MonoPrice. And for some reason I can't get the Mac Mini to dual display, it's only one or the other.

Before I had a Mini Displayport Male and USB Male AUDIO to HDMI Female Converting Adapter (#5969) and I got video on both HDTVs, but not audio at the same time b/c one was USB and one was TOSLINK.

I'm not sure why I can't get video on both monitors. Any help?

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Mac Pro :: Using Dual Apple 24" LED Monitors - Any Sync Software?

Sep 10, 2009

I just set up my 2 Apple LED displays today to my Mac Pro and love the setup. It does seem that the brightness between the two is a little out of whack and I cant seem to get it just right using the manual controls in system preferences.

Does anyone know of any software available the works well in controlling 2 monitors?

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Mac Mini :: What To Need To Hook Up 2 Dvi Monitors

Mar 26, 2012

what cable do i need to hook up a second dvi monitors to a mac mini

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Mac Pro :: Dual-Link DVI With Flash 4870 Versus 4890

Aug 27, 2009

which card I need in order to have dual dual-link DVI?

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Mac Pro :: Won't Work With Expose Performance Dual Monitors On ATI 4870

Jun 16, 2009

I recently purchased a second 22" Dell 2209WA to go with my Mac Pro. They are both running from the ATI Radeon 4870 on my Mac Pro (2009 Quad) but the Expose performance seems to be really quite poor. Displaying all the windows is very juddery and not smooth at all. Is that what I should be expecting now? I wouldn't have on a �2000 Machine. Going into Spaces is fine, it's just Expose thats poor.

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MacBook Pro :: Connecting Two DVI Monitors Of Different Sizes And Resolutions?

Jul 30, 2010

I have a MacBook Pro 13" purchased in 2009, and I'd like to be able to use it as my main computer, which would mean plugging it into my monitors. I currently have two DVI monitors, of different sizes and resolutions (one 24" running at 1920x1080 and one 19" running at 1440x900). Is there any way to use both of these with my MacBook Pro?

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