IMac with 2 HDMI monitors?

My iMac mid 2011 (27 inch) refuses to work with 2 HDMI monitors using thunderbolt to HDMI adapters.
I tested the adapters, they work fine (on their own).
If I replace one of the cables with a VGA adapter both monitors work.
So, how do I get it to work the way I want without resorting to this workaround?

Not sure, see below.
You could hook one monitor up using a mini-diplayport to HDMI adapter.
Mini DisplayPort | Thunderbolt® to HDMI® Adapter w/ Audio Support
Hook the other via USB.
USB 2.0 to HDMI® Display Adapter w/ Audio (1920 x 1080)
USB 2.0 to HDMI Audio Video 1080P Adapter for Windows and Macbook
Newer Technology USB to DVI / HDMI / VGA HD Video Display Adapter
And lastly there's this:
Matrox DualHead2Go
After looking at the descripton of that Apogee MDPHD2X I am not sure whther it distributes one video input to two HDMI's producing a mirrored display or fakes the EDID information like the Matrox to make your computer think it is one lage extended display. More research is needed to verify that.

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IMac with External Monitor

Hi guys, I have a 20" Aluminum iMac with a 24" external monitor. In OSX I have no problems. I can make the external monitor my primary and I can video mirror the displays. However in Windows Vista I cannot figure out how to make the external monitor my primary. (I get the feeling windows won't let me because it is a mobile video card... the check box for which is the primary display is grayed out) This is not a big deal because I only game in Boot camp. So then I decided I could just mirror the displays. With mirroring my game would show on both monitors. I unckeck "extend my desktop with this monitor" but that just disables the monitor. I can find no option to turn video mirroring on. I searched help and it told me to open the mobile computer control panel? but when i opened it Windows said I can only use it on laptops. I am completely stumped. Anyone have any inside tips? Maybe there is just a command I can give to half life to make it play on the second monitor??? I don't know.
Thanks in Advance,
Jeff

we might be having different issues. I get video on the external, but I am unable to make it the primary monitor. I am also unable to make the two monitors mirror the same content. If you are getting no video at all on your monitor something else is wrong.

Horizontal scan lines on iMac with mirror monitor

Hi, I just bought a second monitor which I'm mirroring, using a DVI cable. Everything looks and works great, but when watching video or iTunes visualisation, I occasionally see scan lines on the iMac display, but not the secondary. Also, dragging stuff around is jumpy and funny.
Here's the info from System Profiler:
*ATI Radeon HD 2600 Pro:*
Chipset Model: ATI,RadeonHD2600
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9583
Revision ID: 0x0000
ROM Revision: 113-B2250F-212
EFI Driver Version: 01.00.212
Displays:
iMac:
Resolution: 1920 x 1200
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: On
Mirror Status: Hardware Mirror
Online: Yes
Quartz Extreme: Not Supported
Built-In: Yes
2619:
Resolution: 1920 x 1200 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: On
Mirror Status: Master Mirror
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Television: Yes
Could it be something to do with Quartz Extreme suddenly (?) not being supported on the iMac display?
Cheers!
Message was edited by: Darren Jeacocke
Message was edited by: Darren Jeacocke

Ok update.... I followed directions here http://www.macfixit.com/article.php?story=20081110225534811 and Quartz Extreme is supported on both now, but i'm still getting the ugly scan line.
Profiler now reads
*Chipset Model: ATI,RadeonHD2600*
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9583
Revision ID: 0x0000
ROM Revision: 113-B2250F-212
EFI Driver Version: 01.00.212
Displays:
iMac:
Resolution: 1920 x 1200
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: On
Mirror Status: Hardware Mirror
Online: Yes
Quartz Extreme: Supported
Built-In: Yes
2619:
Resolution: 1920 x 1200 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: On
Mirror Status: Master Mirror
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Television: Yes
Something to do with Master Mirror/Hardware Mirror??

INSTALLATION FAILS WITH HDMI MONITOR CONNECTION

Setup: Gigabyte GA-73PVM-S2H mobo w/NVIDIA 7100/630i chipset
                Intel E2200 CPU
                Seagate 320GB 7200rpm laptop SATA II HD on eSATA
                Seagate 160GB 7200rpm laptop SATA II HD (internal)
                2 GB 800 MHz RAM
                HP w2207h monitor on HDMI port
                Sharp LL-171A-B monitor on VGA port
                External USB DVD
On-board video drives both monitors.
After an eight hour download I attempted to install Win 7, only to spend eight hours troubleshooting the installation process. No matter what I tried the installation always failed about one minute after the ‘Completing Installation’ phase started. There was no hint of what was causing the problem – the monitor screens suddenly went black and the system rebooted. Installation finally succeeded after I disconnected the HP monitor from the mobo’s HDMI port. I tried another install with only the HP monitor connected and the install failed once again.
After the installation successfully completed using only the VGA monitor, hot-plugging the HP monitor to the HDMI port brought the HP to life and Windows automatically set the correct resolution.
This issue is apparently unique to Win 7 because I have not experienced installation issues with XP regardless of monitor configuration.
Once the monitor issue was identified, total time to accomplish a clean install was < 15 minutes on the above system and slightly longer my older AMD – based backup machine. I encountered no other issues with clean installs on the internal HDs or on the external eSATA - connected HD on either system.   IMO, MS has done an excellent job in redesigning the installation procedure. The entire process is about as hands-off as it can get and it’s fast, too. Nice job, guys!
2Pi

OMG! It worked! Unplugged HDMI and DVI. Used an old VGA Cable for my TFT and it all worked. Windows installs the nVidia driver right after you log in the first time. After that HDMI and DVI work. Cool.
Screenshot here

[S]iMac with additional monitor: built-in monitor turns off at startup

Hi,
I'm using an iMac Intel (2007) with an external monitor. I used to have the external one on the left and the iMac on the right.
Everything was fine until today, when I *just* moved external monitor on the right and changed my xrandr script like this:
xrandr --output LVDS --mode 1680x1050 --pos 0x0 --rotate normal --output DIN --off --output DVI-0 --mode 1920x1080 --pos 1680x0 --rotate normal
The thing is that now when I turn on the computer the built in monitor turns off as the startup process reaches the Xorg phase.
Do you have any ideas about why this happens?
I didn't touch the Xorg configuration at all, when I installed the system both monitors were recognized correctly.
Thanks in advance!
Last edited by ifsixwasnine (2014-04-03 13:01:06)

Hi karkhaz,
Yes, computer is usable with just the external monitor, as a temporary workaround I'm running a `xset dpms force off` to turn off and on again both monitors.
xrandr output:
Screen 0: minimum 320 x 200, current 3600 x 1080, maximum 8192 x 8192
DVI-0 connected 1920x1080+1680+0 (normal left inverted right x axis y axis) 521mm x 293mm
1920x1080 60.0*+
1680x1050 60.0
1280x1024 75.0 60.0
1440x900 75.0 59.9
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 72.8 66.7 60.0
720x400 70.1
LVDS connected 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 270mm
1680x1050 60.0*+
1400x1050 60.0
1280x1024 59.9
1440x900 59.9
1280x960 59.9
1280x854 59.9
1280x800 59.8
1280x720 59.9
1152x768 59.8
1024x768 59.9
800x600 59.9
848x480 59.7
720x480 59.7
640x480 59.4
DIN disconnected (normal left inverted right x axis y axis)

20" iMac with Dual Monitor?

I have a 20" iMac (early 2009) and i love it! However I've learned lately of dual monitor setups. Can the iMac handle a dual monitor setup? And what are the advantages of a dual monitor setup? I use my iMac for email, web browsing, ichat, ilife, iwork, and mostly word processing on ms office (for school, reports etc.).
What are the pros/cons of dual monitor setup and would I benefit from a dual monitor setup?
Any information and photos of dual monitor setups are welcomed.

The second display extends your Desktop. So you can place your windows on either screen. It's basically like having a bigger screen - more space to work in. That's the main pro.
There are no cons, except maybe the extra space the second display will occupy on your real desktop. On really old Macs, the second display had an impact on performance, but that is a non-issue on current system because the video hardware and CPU are more than powerful enough to run two displays.
Once you connect the second display, you can set it up in System Preference Displays pane Display tab. You can arrange the relative locations of the two screen on the Arrangement tab. You can even move the menu bar and Dock to the second display, if you want to use it as your primary screen.

How do I use my late 2011 iMac ( with thunderbolt) as external monitor for laptop/Xbox or other device with hdmi as output.

May be this question has been asked thousand times. how do I use my mid 2011 iMac ( with thunderbolt) as external monitor for laptop/Xbox or other device with hdmi as output. if apple hasn't removed that feature and has just moved that functinoality to thunderbolt then how can I use it. currently there is no laptop available with thunderbolt output. no 3rd party converter available. whats the use of having feature on latest functionality if we cant use it. I wish they would have made one port has mini-dvi and other thunderbolt for backward compatibility untill some vendor comes up with converter.

It Says :
Mac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011) and later computers support Target Display Mode via Thunderbolt to Thunderbolt cable (2 m) when the source is another Thunderbolt-equipped computer.
Name one computer model/vendor which has thunderbolt as output for display + audio. this is so stupid to move to new technology without availbility of its compatible devices.

Premiere Pro CS6 with external HDMI monitor

Hello all
Is it possible to use an HDMI monitor as an external preview monitor when editing with Premiere Pro CS6? If so, then how is it connected, and where can i find the correct tick box in
Premiere Pro CS6? I have an apple iMac (early 2009) intel core 2 Duo (if this is relevant).
I need to be sure of the correct colour/look output, etc.
Any advice would be greatfully received.
Thanks
Karl.

Hi Ferret Head,
Please go to premiere pro>preferences>playback
and check the option for the second monitor under video device.
Thanks

How do I use an external Monitor to access files on my iMac with a broken screen?

I have an 20 inch desktop iMac with a broken screen. It is the files on the computer that I wish to recover, after that, I can be on my merry way. Unfortunately, VileVault was on (Not my choice), and for some reason, when I target the disc image of the broken mac with a new one, ONE of the accounts "appears" to be completely empty. All of the accouts were running FileVault, but only one (mine) failed to be transferred because it is "empty". I refuse to believe that my files are actually all gone, because theoretically there should be nothing wrong with the CPU itself, just the screen.
Thus my goal is to use a monitor on my broken screen iMac and simply log in and access my files normally, and perhaps pull them out with a USB or something. I have a DELL monitor, and a DVI (The big hairy plug with screws I think) converter that works with my old iMac, along with the male/male DVI cord. However, when I hook it up, nothing happens. I have tried booting the old CPU while holding F7, and option as I read on a forum, and neither produced results.
Does anyone have any ideas on how to 1. Get the monitor to simply show what's going on on the mac? or 2. Pull out my files through some other means?
Thank you.

If you have a second Mac computer, you may want to try to copy over as many files you can. One way is to use target disk mode.
http://support.apple.com/kb/HT1661
http://lowendmac.com/misc/06/0710.html
You need to follow this procedure to recovering a filevault id. Mac OS X 10.3, 10.4: FileVault - How to verify or repair a home directory image ... http://support.apple.com/kb/HT2631?viewlocale=en_US
Robert

I want to connect my IMAC to TV with HDMI cable. I did it before going to Dispaly and Arrangments and then mirror. Now when I go to display I dont have to option of arrangements. Olny {Display and Color} pops up. Any ideas what happend to arrengements?

I want to connect my IMAC to TV with HDMI cable. I did it before going to Dispaly and Arrangments and then mirror. Now when I go to display I dont have to option of arrangements. Olny {Display and Color} pops up. Any ideas what happend to arrengements?

For the "Arangements" option to appear, the external display must be turned on with the correct input selected and connected to the computer. Then close system prefs, reopen, go to "Display" and "Arrangement" will be along the top.

HT4241 No signal on external monitor with HDMI on MacBook Pro (13-inch, Late 2011)

HI i have a MacBook Pro (13-inch, Late 2011). some days ago i connected it to my LG plasma 60" with HDMI. i used the DVI --> HDMI converter from apple. the it worked fine and i could se films om the tv. but now nothing happens when i connect the mac. help??

Hello,
I had this problem with y Macbook Air and an Asus LED monitor 21.5". The very first time I tried the two together, it worked perfectly. The second time it didn't work and I tried different things to make that "No HDMI signal" go away.
The only thing that worked for me was connecting both devices OFF, once connected I turned the monitor ON first and then started my Macbook Air.
I really hope this helps some of you.
Good luck

Can I use the HDMI out on a HP ALL IN ONE TOUCHSCREEN Desktop to connect a second monitor with HDMI

Can I use the HDMI out on a HP ALL IN ONE TOUCHSCREEN Desktop to connect a second monitor with HDMI in without any additional software or graphics adaptor. I have a 520-1070
HP - 23" Touch-Screen TouchSmart All-In-One Computer - 8GB Memory - 2TB Hard Drive ? I used a HDMI to HDMI cable and the monitor was not recognized.

Here are the specs for your HP TouchSmart 520-1070 Desktop Computer. As previously stated your computer Doesn't have a HDMI output, instead it has a HDMI input. This is designed to let you connect a game console, a DVD/Bluray player, etc. to use as a monitor.
If you wish to conect a second monitor to your computer, you will need to use a USB-to-video adapter such as the EVGA UV Plus+ UV39 or EVGA UV Plus+ UV19. Using an adapter like these with the touch feature of your computer may cause issues with pointer control and you may need to disable the touch feature to use "extended desktop".
Frank
{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
This is a user supported forum. I am a volunteer and I don't work for HP.
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How many monitors can you use on a new imac with GEForce 780m?

My husband bought a new 27" iMac with the optional GEForce 780m with 4 gig of video ram. He wants to know how many monitors he can run simultaneously, and at what resolutions. He would obviously be using the Thunderbolt ports to do this. I thought this information should be easily found in the technical specs for either the iMac or the video card itself on the NVidia site, but it is not.

Catherine Gramze wrote:
Ok, rkaufman. Can he use two 4k monitors in addition to his iMac display? He wants to know what his options are in terms of number of monitors and the resolution. Yes, I know which monitor you buy will be the limiting factor for the actual display, but he has not yet purchased these additional monitors. If thunderbolt allows him to run 3840x2160, how many of them can he run at once at 32 bpp? How many if he chooses 2560x1600 instead?
To be honest I don't know how many Thunderbolt displays he can run, I would STRONGLY recommend contacting Apple to ask. You can ask the online store (phone number is in upper right of it's home page) or if you have an Apple Store in your area, making an appointment with a business specialist and asking that question.

How can I get a MacBook with a dead display to display to an HDMI monitor upon bootup?

I have a MacBook with a dead display that I'd like to use as a desktop. I also have a 23" monitor with VGA and HDMI input. I am using the DVI adapter on the MacBook, and a DVI to HDMI converter to connect to the monitor. The problem is that when it boots, it's extending the desktop over onto the monitor rather than mirroring or using that as the primary display, which is unhelpful.
Is there a way to get it to use the external HDMI monitor as the primary?
Do I need to buy a mimi-DVI to VGA adapter to accomplish this?
I know this works if I connect the MacBook to a monitor with DVI input. The problem is that my only options are VGA or HDMI for my current monitor.
Thanks!

Yes. Use a Mini DisplayPort to dual-link DVI adapter.
(71350)

24" Intel iMac with Samsung T220 as second monitor

Hello!
Recently got an iMac with a Radeon 4850 video card which I am generally very pleased with, however..
Before I got it I used a Samsung T220 as my main monitor which provided a crisp and colourful display. When I got the iMac I decided to use it as a second monitor so ordered a miniDisplay port to DVI adaptor.
Now the issue is that while it appears to be allowing the T220 to output to it's maximum resolution (1680 x 1050) the picture still appears to be blurry. On top of this the colours appear washed out and the contrast (20,000:1) seems very low compared to when I used the monitor with my PC.
I've spent hours attempting to calibrate the monitor and playing around with colours and settings. I am using the DVI-D cable supplied with the Samsung.
Any thoughts? Do I need to update any drivers or software or is it something more fundamental.

Some display settings are stored in PRAM, so if you have not done so already, try resetting PRAM
http://support.apple.com/kb/HT1379
If there is a reset button on the display (often a recessed button), or a reset-to-default command in the display's on-screen menu, try using that as well.
There was one firmware update involving that video card
http://support.apple.com/downloads/iMac_EFI_Firmware_Update_14
It may already be installed. You can check your current Boot ROM Version by running System Profiler and selecting Hardware in the sidebar.

IMac with 2 HDMI monitors?

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