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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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 :: 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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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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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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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:

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


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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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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Hardware :: AEBS Dual Band Versus 1 Signal?

Oct 26, 2009

After the announcement of the Simultaneous Dual-Band II, I've taken an interest in getting the most out of my version. However, I've been noticing signal issues especially when using the 5 ghz network. I have it set to "wide channels", multicast rate of "High", deselected "closed network" and "interference robustness", and the transmit power at 100%.

I've adjusted the position of the router to avoid potential sources of interference, and when I go to select a network with the airport icon at on the task bar, my 5.0 ghz network is never at full strength. In fact, it rarely shows more than 2 bars. As I type this post, I am literally six feet from the AEBS and I have only 3 bars showing.

When I view the statistics within the Advanced Tab in the Airport Utility I am only showing a rate of 65 mbps on the b/g/n (2.4ghz) network and 270 mbps over the 5.0 ghz n network.

Does anyone have any idea how to get this thing going at full performance? When I'm in the adjacent room, I am rarely able to get over 200 mbps. I know a wall is in the way, but my apartment is modestly sized and it is very disappointing that the signal is this weak on this lil thing - especially given the fact that I've had it for just about a month and its been updated to address the signal issues.

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OS X :: Spaces And Dual Monitors?

Oct 26, 2007

I'm curious if anyone has tried out Spaces with Dual Monitors yet?I'm not sure if it will matter or not, would kind of be cool to be able to specify which space goes to which monitor.....I have a New iMac with extra 20" LCD and will be upgrading to Leopard tonight, so I guess I'll know then...just wondering what to expect.

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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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OS X :: Dual Monitors Act As One Virtual?

Apr 20, 2009

I was wondering if in anyway possible on a mac I can make my two monitors at the moment act as one virtual monitor? Know what I mean? So I want like one extra wide resolution which would cover both screens, not a separate resolution for each. Hope this is possible, much be in some way.

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Mac Pro :: Mac Pro And Dual 24" ACD Monitors?

May 18, 2009

Does anyone have dual 24" Apple Cinema Display monitors hooked up to their Mac Pro?

If so how did you hook it up, buy and adapter or?

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MacBook Air :: Dual Monitors On 2.1 Ghz

Jul 30, 2009

Is it possible to run two monitors independently via a hardware device with the macbook air? I would like to do it with a device that works well but doesn't cost a fortune.

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OS X :: How To Use Hot Corners With Dual Monitors

Sep 12, 2009

Does anyone know how to get hot corners to work on dual displays? I had a monitor plugged into my MBP 2.5ghz and after changing the relative location of the monitor in display settings, left of main screen to top of main screen, the lower left corner would allow me to access Expose for the applications in the current monitor, instead of exposing all application windows on both screens. This feature is very helpful though I cannot repeat it. Is there a certain orientation of the monitors that will allow each screen to have it's own hot corners functioning for that screen of was this just a fluke?

it would be nice to be working on one screen and watching a movie on the other without the movie expose ing when I only want to expose the applications/windows on the monitor who's corner I accessed.

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Hardware :: Best Way To Add Dual Monitors

Nov 5, 2009

So as of now I have my 13" MacBook White connected to my Dell 20" S2009W, and I'd really like to add another S2009W, but I'm looking for the BEST possible solution to do this. I've looked at DualHead2Go, and Diamond.

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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?

Mac Pro, Mac OS X (10.7.3)

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Intel Mac :: How To Set Up Dual Monitors For It

Apr 24, 2012

I have an intel imac and would like to set up a second monitor to allow for more simultaneous side-by-side space when I do programming/editing.  As I'm not interested in paying $1000+ for an apple monitor, I'd like to use a third party one.  Thus far, I think I need a VGA to MiniDVI adapter [url], but then can I use ANY monitor that has a VGA port?  And then will it be as simple as plugging in the second monitor and detecting it?  Will the iMac screen remain unchanged?  Will the computer just "know" when I scroll across one screen to the other

iMac, Mac OS X (10.6.8)

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PowerPC :: Mac G4 Quicksilver - Dual ADC Monitors?

Sep 10, 2010

Just picked up a minty Power Mac G4 Quick Silver and two ADC Studio Displays. I'd like to hookup both displays, but I only see one ADC port. What's my lease expensive dual ADC display option for this machine?

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IMac :: Using 21.5": Dual Monitors

Dec 21, 2010

I do not know much about this, so if i don't explain clearly, ask and i'll try again.

So basically, i have an iMac 21.5" Late 09 model here and a LOGIK TV next to it that has a channel for 'PC', i was wondering if it was possible to use them as 'dual monitors' for the iMac?

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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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Windows On Mac :: VM Fusionware And Dual Monitors

Aug 29, 2008

I am a web developer, and we are a Windows shop, but many of us are moving to Macs since we can run both OS X and Windows on the same machine. Well my work is purchasing a Macbook Pro for me, and I'll be hooking up an external monitor to it to replicate the dual monitor setup I have now.

As I learned in the OS X forum, I'm able to specify which programs I would like to launch in which "Space" upon boot. My question is, is VM Fusionware compatible with a dual monitor setup? As an example, could Space "1" contain my OS X desktop on both monitors, and then if I switch over to Space "2" which has VM Fusionware running with Windows, will the windows desktop span both screens as well?

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Mac Mini :: Can Support Dual Monitors

Mar 4, 2009

I are disagreeing over the new MAC Mini and the two video cable connections on the back. He said it will support dual monitors and I said it is just a different type of connection for one monitor.

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OS X :: How To Setup Dual Monitors For IMac 07-08

Sep 28, 2009

I�m looking to setup another monitor for my 07-08 iMac, I have tried searching and googling for an answer but don�t seem to have had much luck, so I have got a few questions.

1. Is my iMac even able to support dual monitors?

2. If so how would I go about this?

3. Will just any monitor work or has to be a certain type?

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Applications :: How To Setup Dual Monitors With FCE

Jan 3, 2010

How do i setup duel monitors with FCE so i can see the video in full screen on the second monitor.

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OS X :: How To Get Two Movies On Fullscreen On Dual Monitors

Jan 10, 2010

This has been going on since the beginning of time: You put 1 YouTube video in fullscreen (on screen #1). You click anywhere on screen #2 and screen #1 leaves fullscreen! Is there an app or script that will allow me (and the rest of the world) to watch 2 flash videos in full screen on 2 monitors? I even tried 1 video in Safari and one in FireFox but to no avail.

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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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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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MacBook Pro :: Dual External Monitors?

Apr 13, 2010

I was wondering if it was possible to utilize dual external monitors with the Macbook pro's. With my thinkpad and a port rep I can use dual monitors as long as I keep the lid closed on the laptop. Is this possible with the new macbook's that were released today?

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Hardware :: Dual Monitors On Macbook

Aug 17, 2010

I am looking to hook up two ~20" monitors to my macbook pro. My office is a PC environment, so I need to boot into PC mode (any advice as to the best software to use? VMWare?), log into my company's remote access, and then use a PC peripheral keyboard and mouse and work in excel and powerpoint.Any advice as to the following: 1) how I hook up the two monitors (i.e. what cables / extra peripherals i might need, any tips on dealing with remote access) 2) any recommendations on PC keyboard and mouse, any tips you might have there. 3) what the best low-cost monitors are.

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MacBook Pro :: Will Run Dual 1080p Monitors

Aug 28, 2014

I have mid2010 15-inch macbook pro with NVIDIA GeForce GT 330M 256 MB graphics. My question is can i run dual 1080p monitor setup?

MacBook Pro, OS X Mavericks (10.9.4)

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