Monitors recognized by MacPro yet no display

I purchased 2 Hanns G HK241DPB monitors for my Mac Pro. I hooked them up and had no display from either one.
So I hooked up my older Samsung monitor and one of the new monitors as a 2nd monitor.
The new monitor is recognized when I click 'Check Display' yet I get no picture from it. I tried calibrating it, selecting another profile. Nothing works.
I'm using the DVI connection. I called the manufacturer and they said the monitor should work fine with a Mac.

Thanks for the suggestions. Much appreciated.
After trying everything mentioned (and more) I just couldn't get these monitors to display.
I picked up a couple of AOC monitors at Best Buy. While they are working, I'm now tracking down an annoying problem where the 2nd monitor only works at a lower resolution. Argh! This dual monitor setup is so frustrating.

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External vga, monitor recognized, still no display

I have a L R60 9461-DXG, with Win7 (32bit) running very fine.
Now trying to use an external monitor (L171p) but nothing works.
While in boot and in combination with Fn+F7 the display doesn't come up (staying in power saving mode).
In Win7 the external connected monitor is recognized and displayed as a L171p, enabling the monitor is possible but again the display doesn't come up.
Is this a driver error or could there be a hardware malfunction?
Installing (Vista) Ati Mobility Radeon X1400 drivers from the L site didn't solve the problem.
Please help.

Not necessarily, but the probability of receiving a solution from other members, who are also using a similar setup, is most likely better here.
edit; grammar
Message Edited by andyP on 06-15-2009 10:36 PM
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Using DVI and VGA monitor simultaneously on MacPro

using DVI and VGA monitor simultaneously on MacPro!
2008 MacPro - running the latest Yosemite
for the last few years, I've had two monitors attached - both DVI monitors in the DVI port.
today, one of the two monitors died on me! Just wouldn't turn on.
As it happens, I also have an older VGA monitor. So, this evening I bought a VGA-to-DVI adaptor.
when I plugged it in, something buggy happened ... the image was fine at the first, but then for a while, the active application started flashing off & on, it flashed between the image of the APP and a white panel... just the active APP. the background apps looked fine.
now it seems to have stopped .. .but I fear it may come back?
no idea what may be causing it! is it NOT a good idea to use DVI and VGA monitors simultaneously on a 2008 MacPro?
Hope it doesn't come back. right now I'm in safe start-up mode, I'll see what happens when I run normal start-up mode tom'w morning.
thanks for any feedback / insight!
will

this is all the info from ABOUT THIS MAC
I believe the video card is the original from 2008 - I don't think I've changed that since the machine was new :
ATI Radeon HD 2600 XT:
Chipset Model: ATI Radeon HD 2600
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9588
Revision ID: 0x0000
ROM Revision: 113-B1480A-252
EFI Driver Version: 01.00.252
Displays:
SyncMaster:
Resolution: 1280 x 1024 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: HCJX844788
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
LCD19D(TMDS):
Resolution: 1280 x 1024
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: WCCE5100535
Mirror: Off
Online: Yes
Rotation: Supported
thanks again!
minor update: I went back to the DVI monitor, using another 12V AC cable, and it seemed to work, but then that one just started flickering (after being on for an hour or so...) the flickering stopped after a few minutes, but something tells me that I'm not out of the woods yet...
w

Good Secondary Monitor to go with 24 Cinema Display

I am using a 24 inch cinema display as my main monitor, I also have a Dell Ultrasharp 20 incher on the side. I want to get another 24 inch monitor so I have matching monitors, but I don't wanna spend another grand on another apple monitor.
What would be a good monitor to go with my 24' display. I noticed a lot of them are not as bright as the Apple, does anyone know one that is good quality (doesn't have to be as good as the cinema display. My budget is around 300-450.

I've been researching the same thing. I don't know your primary purpose for a monitor, but I'm looking for one I can use for photo editing and print design--and the high end monitors are far out of my unemployed budget...So if you're looking for a monitor for primarily photo editing vs. gaming, here's what I've figured out so far: basically, be very leary of monitors with super-low response times (which are better for gaming (and possibly movie editing?). From my understanding they achieve this at the expense of color reproduction. The ones to look for for photo editing use S-IPS panels. A few websites warn that some brands (like Dell) might vary the type based on production run. I'll also get either huey, colormunki, or spyder. Haven't had a chance to research those yet.
One I'm looking into is by HP...it's ugly, but it's the least expensive IPS monitor I can find, and it's currently about $530. But I also believe that if a product is any good, the manufacturer will stand by it for 3 years...without charging additional money. (AHEM! I clearly make an exception to this rule, but I don't like it!)
A couple of good websites: http://www.pchardwarehelp.com/guides/lcd-panel-types.php and http://www.pchardwarehelp.com/guides/s-ips-lcd-list.php

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Hello,
I am using an LG L246WHX monitor and wondering wether this is normal that system recognizes the monitor as a TV and confirms that no display is connected?
I did not install any driver, etc, just plugged in via the DVI/HDMI connector included with the monitor.
Screenshot of system profiler below:
thank you!

Only problem with monitor is some strange gamma, some transitions look bit crappy but maybe this is due to calibration. For example the bottom part of the official leopard login screen seems awful. after login normal pictures are displayed correctly, but i was wondering this has anything to do with being recognized as a TV.
the display is connected to the miniDVI port with the miniDVI-DVI+HDMI adapter.

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This is an update on the question about the use of the Dell P2415Q 4K monitor with MacBook Pro 13" and 15" w/ Nvidia graphics card installed. The monitor works very well with both systems and is automatically identified when connected. The 13" machine with Iris Graphics defaults to 2560 x 1440 at 60hz. This was very workable, matching the Apple Thunderbolt Display for resolution. I was not able to set the display for full 4K at 3840 x 2160, even at 30hz. Just not enough horsepower with the basic Intel CPU with Iris Graphics. But make no mistake, the setup works well and the screen looks great.
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Prolem to connect more than 2 monitors to new macpro

hi
i have a problem to connect more than 2 monitors with minidisplayport to dvi adaptor in my new macpro

One hdmi, One minidisplayport to dvi and 4 adaptors
http://store.storeimages.cdn-apple.com/4545/as-images.apple.com/is/image/AppleIn c/aos/published/images/M/B5/MB571/MB571?wid=800&hei=800&fmt=jpeg&qlt=95&op_sharp en=0&resMode=bicub&op_usm=0.5,0.5,0,0&iccEmbed=0&layer=comp&.v=1400689396361
Le 13 avr. 2015 19:03, "abdelhaq larhrissi" <[email protected]> a écrit :
I upgrade my osx to 10.9.5 and now i can connect 6 Samsung 40" full hd to
m'y macpro
Le 11 avr. 2015 17:45, "Apple Support Communities Updates" <
[email protected]> a écrit :
>>                  You received a reply       *lllaass
>> <https://discussions.apple.com/people/lllaass?ac_cid=op123456>* has
>> replied to your question. You can view the full discussion
>> <https://discussions.apple.com/message/28048945?ac_cid=op123456#28048945>
>> in Apple Support Communities.            prolem to connect more than 2
>> monitors to new macpro
>> <https://discussions.apple.com/message/28048945?ac_cid=op123456#28048945>
>>
>> If the resolution of the displays is 1920x1200 or less you do not need
>> the $99 dual-link active adapter. An active adopter like this will work:
>>
>> http://www.amazon.com/Accell-B087B-006B-2-DisplayPort-Single-Link-Certified/dp/B
>> 0098HVZA0/ref=sr_1_3?ie=UTF8&qid=1421443…
>> <http://www.amazon.com/Accell-B087B-006B-2-DisplayPort-Single-Link-Certified/dp/B 0098HVZA0/ref=sr_1_3?ie=UTF8&qid=1421443353&sr=8-3&keywords=ACTIVE+DVI>
>>
>> http://www.startech.com/AV/Displayport-Converters/Mini-DisplayPort-to-DVI-Active
>> -Adapter~MDP2DVIS
>> <http://www.startech.com/AV/Displayport-Converters/Mini-DisplayPort-to-DVI-Active -Adapter~MDP2DVIS>
>>             Correct Answer
>> <https://discussions.apple.com/email/thread/6989032/correct/28048945> Helpful
>> Answer
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>> the buttons above to tell lllaass and the rest of the community if this
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GTBannah wrote:
Thanx for the reply! What monitor would you recommend, that has the same quality as the Apple, minus the glare?
Can't help you there...
I have a MacBook Pro 15" with the anti-glare display which is great for out an about where you have little control over the lighting or what is behind you. In my study, where I can control the lighting to keep the reflection and glare to a minium I use a Apple Thunderbolt display.

Using a IP191 monitor, have random horizontal streaks on display - have no problem with other browsers; also no problem with FF on other family PC's

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Monitors recognized by MacPro yet no display

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