2010 iMac Target Display Mode not working

I'm trying to use my 27" 2010 iMac with OS X 10.7.5 as the display for my Power Mac G4 using Target Display Mode, but command+F2 doesn't do anything. I have it hooked up from the G4 using a DVI -> Mini Displayport adapter into the iMac. I've tried having the G4 plugged into the iMac, shutting both down, booting the G4 first and then the iMac. I've tried repairing my disk permissions on the iMac. I'm using an Apple keyboard and have tried both a wireless and USB keyboard, still no luck. Is what I'm attempting impossible or am I doing something wrong?

Target Display is working on the iMac, but by default, the MacBook Air uses the external display (in this case, the iMac) as an extended display, so you have to drag the windows to the right of the display of your MacBook Air and they will appear on your iMac.
If you want to show the same on both MacBook Air and iMac displays, see "Video mirroring" > http://support.apple.com/kb/HT5019

Similar Messages

MacBook Air to iMac Target Display Mode not working

I would like to connect my MacBook Air (13") with my iMac (27") to use the latter as an external display with Target Display Mode.
I followed instructions from a number of posts (http://support.apple.com/kb/PH14264), and connected the two with thunderbolt cable and hit Command-F2 -- the iMac goes black and MacBook stays the same. One post suggested dragging windows over to the iMac as an extended display, and I was able to drag Safari totally off-screen, presumably onto the other display, but the iMac still appeared black
Other issue is that hitting Command-F2 again doesn't do anything. I could only get the iMac out of TDM when I unplugged the thunderbolt cord.
I have a brand new Macbook Air and iMac along with new thunderbolt cable (all purchased at Apple Store in 2014). Would appreciate any help, thanks!

Additional twist to this...
Tried to troubleshoot and reset the System Management Controller (SMC) per http://support.apple.com/kb/HT3964
When I hit Command-F2, one window from my MacBook will display on the iMac (it was Safari a few times, Outlook once), but neither keyboard/mouse can DO anything in that screen. That window also disappears from the MacBook. And I can only return after unplugging thunderbolt (not command-F2).
Help please

Target Display Mode not working iMac 27(2012) Bootcamp to iMac 27(2013)

Hi All,
I recently purchased an iMac 27" 2013 which replaced my iMac 27" 2010.
===============
PREVIOUS SETUP
===============
(1) iMac 27" 2012 - Running Windows 8.1
(2) iMac 27" 2010 - Running OS X Mavericks
(1)+(2) were connected with a Mini-Display-Port cable.
(1) was using (2) as external display while (2) was set to Target Display Mode using CMD+F2
==============
CURRENT SETUP
==============
(1) iMac 27" 2013 - Running Windows 8.1
(2) iMac 27" 2012 - Running OS X Mavericks
(1)+(2) are connected with Thunderbolt cable.
(1) can't use (2) as external display anymore becuase CMD+F2 has no effect anymore on (2) in this scenario.
If (1) and (2) are both running OS X all works as expected.
I am aware about the support hint from Apple where they state TDM is not working under Bootcamp.
And I agree, while booted into Windows Bootcamp this machine can't serve as external display. Makes sense because TDM is baked into OS X display drivers.
Anyone had the same experience and came to a soltuion?
Thanks,
Martin

"Apple has no plans to implement a client driver for Windows since there is no Thunderbolt SW stack available for Windows like there is for Display Port."
That is a little bit funny since Gigabyte and other big companies have said that 2014 is the year that they are going to implement Thunderbolt in many motherboards.
"GIGABYTE 7 series motherboards are the very first to offer fully certified dual onboard Thunderbolt™ ports. Capable of connecting up to 12 devices plus 3 digital displays simultaneously with breathtaking data transfer speeds that can transfer 1TB of data in only five minutes, GIGABYTE Thunderbolt™ motherboards offer the fastest connection interface on the desktop PC."
Have you asked Apple about that? I dont understand why Apple is crippling Thunderbolt on their devices...

2010 iMac target display mode with 2013 Mac Pro

I have a 2010 27-inch iMac that I want to use with target display mode for a 2013 Mac Pro. I have a mini display port to mini display port cable connecting them. When I plug the cable in the iMac screen goes black, but eventually reverts back to iMac desktop. Pressing Cmd-F2 makes it go black again, but eventually reverts back. I was under the impression that this was the correct cable to use to connect, but it doesn't seem to work. Anyone have ideas for what to do? What am I missing? Thanks!

You can use the cheaper single link adapter
<http://store.apple.com/product/MB570Z/B/mini-displayport-to-dvi-adapter>
if you don't have more than two DVI or HDMI displays.
<http://support.apple.com/en-ca/HT202801>
If you will be using more, you can still use a single link adapter, but it must be ACTIVE, such as
<http://www.amazon.com/Accell-B087B-005B-DisplayPort-Single-Link-Certified/dp/B00 4071ZX0>

15 inch early 2011 Macbook Pro to Mid 2010 27 inch Imac Target Display Mode

Hi Guys
I have a early 2011 15" Macbook Pro with thunderpolt port aswell
as a Mid 2010 27" iMac with MiniDisplay port.
I am trying to use the iMac as a second screen for my Macbook.
Both has Mountain Lion on them.
I have both Thunderbolt to Thunderbolt aswell as miniDisplay to MiniDisplay
cables.
I can't get target display mode to work.
The thunderbolt cable doesn't work at all.
The MiniDisplay does seeem to work to an extend but not completeley.
When i plug in the MiniDisplayPort cable to both machines then
the Macbook pro screen becomes blue which means secondary monitor detected.
iMac screen becomes blank. Sometimes i have enough time to see in system preferences that
the Macbook pro actually has a secondary monitor.
But just as it turned blue on the Macbook pro and black on the iMac. It turns blue again
and the iMac returns to it's Desktop.
The exact same happens when i Press Command + F2 on iMac keyboard.
Any help or ideas?

I have a 13"macbook air and a Dec. 2012 iMac 27". Out of the blue it stopped working in Target Display Mode. Switching cables doesn't help, and the iMac and MBair are connect to power. I can see the iMac screen in Share Screen mode on the MB air.
This seems to be an issue, I have encountered eg. in MacRumours:
Jan 11, 2013, 10:17 AM
#5
martinm0
macrumors 6502
Join Date: Feb 2010
I have the same issue with my 2012 27" iMac (3.4, 680MX). When I initiate Target Display mode the iMac goes black and never comes back up. On the laptop I can see the display in Display Preferences, but its as if the backlight doesn't come on in TD mode. (I even did screen sharing into the laptop and can see both displays there.
Anyway, called Apple and they determined its an issue and I have to send in for a replacement.
Anyone else with a 2012 iMac (21.5 or 27), can you please test out Target Display mode and let us know if things are working or not?

Mid 2010 27" IMac Target Display Mode has stopped working

I have a 27" mid 2010 IMac, NOT the thunderbolt version, and have been using it in target display mode for my Mac Pro and 2010 Mac Mini with no problems. I have used the Belkin cables, and routinely would switch between internal and external machines using Command-F2. Worked like a champ for about 7 months.
Today, with no obvious change, I cannot get the IMac to enter TDM. This is true whether I use the Mac Mini or the Mac Pro, and is true using either of two Belkin Cables.
I reset the PRAM and NVRAM on the IMac, but this made no difference. I changed keyboards from my Bluetooth IMac keyboard to an Apple USB keyboard. Again, no improvement. I have rebooted the machine without benefit. The IMac seems to function just fine in every other respect.
Since I have no other monitor that supports the mini DisplayPort on the two other machines, I am dead in the water at this point.
The machine is a mid 2010 27" IMac, OSX 10.6.7, 2.93Ghz I7 CPU, 16 Gb RAM, 480Gb SSD and has worked well for quite a few months.
Any help will be appreciated.

When the display only shows the background, it's working in extended desktop mode. That's a logical extension of your desktop to the right of the MBP. Drag an application off the MBP to the right and it will appear on the iMac. When you close the lid of your MBP the iMac becomes the primary monitor in Clamshell mode.
If you want to mirror the MBP to the iMac then press CMD F1, press again for extended desktop mode. These settings are in System Preferences > Display > Arrangement tab.
When the iMac is in Target display mode, you don't use the keyboard on the iMac. Use the keyboard on the MBPro.

HT3924 any HDMI converters available for iMac target display mode yet?

Just got this bed with a pop-out TV, and I'm thinking about getting an iMac 27" to use instead of a TV. Problem is, I'll also want to attach an Apple TV or Freeview box to my iMac - so I can play content from my iPad / watch live TV from the freeview box. This would be technically possible with target display mode, except the Apple TV / Freeview box don't have mini display port output.
Anyone know if there are HDMI to mini display port adapters available yet to facilitate this? From what I've read most of them only output from mini display port to hdmi, not the other way round.

I have a Asus HD6570 2GB Graphics Card in that computer with HDMI out, DVI out, and VGA out. I have a Asus HD6570 2GB Graphics Card in that computer with HDMI out, DVI out, and VGA out.
None of those will work.
It has to have a Mini DisplayPort, not evn a Display port will work.
ScreenRecycler...
http://www.screenrecycler.com/ScreenRecycler.html

Using iMac (Target Display Mode) as an External Display for MacBook Air

I have a Mid 2010 iMac with a 2 thunderbolt ports. I now have a brand new MacBook Air (2012 Core i5 1.8GHz with 8GB RAM) with a thunderbolt port. I have a Belkin Mini Displayport Cable to connect the two. I want to use the iMac as an external monitor for the MacBook Air. I cannot seem to get this to work. Can I do this? Do I have the right cable?

You can do it but you need a thunderbolt cable to connect the two. Then just hit CMD F2 on the iMac and it will enter Target Display Mode.

2008 iMac - Target Display Mode?

Hi! I am a little confused it looks like newer versions of the iMac 2009+ support target display mode but I can't find any info on older iMacs. I have a 2008 iMac that has a mini DVI on the back and a 2010 MacBook Pro with mini displayport. My question can I use the iMac as a monitor for my MacBook Pro? Can I take a mini displayport cable to DVI and a DVI to mini DVI to the back of the iMac? Or is the mini DVI on the back of the iMac an output only? If so does it allow you to use a second monitor?
Thanks!
Guy

I hear you - I'm trying to make it 4 (at a little over 3 right now) because I have some camera gear I want to buy first. My iMac has been crawling a bit lately especially when running Aperture. Just did a fresh Lion install this weekend and it seems to have improved. Was thinking about getting a super beefy Mac Mini and a 27" Cinema Display instead of an iMac next time - that way I can upgrade sooner and not feel so bad about it. Keep the Cinema Display and replace the Mac Mini every 3. Else bite the bullet and get a Mac Pro - but not sure I want a giant cheese grater

Apple Mini DVI to DVI Adapter to connect Win7 tower to iMac / Target Display Mode

I currently run Windows on bootcamp on the iMac (Mid-2011), although the tasks I perform (3D modelling, rendering and such) cause the Mac to get very hot, and as a result hae a slight burn mark on the LED LCD screen.
I am buying a Windows machine, and am to uninstall bootcamp and use the Mac purely for OSX, but use the iMac screen as a monitor for the tower using Target Display Mode. My issue is - the Windows 7 tower only has DVI output. And as I understand, the Mid-2011 iMac only supports Target Display Mode via a thunderbolt cable.
My question is - Will the Apple Mini DVI to DVI adapter allow me to connect the DVI-only tower to the iMac? Thanks in advance x

Oh, I should mention also that the iMac is the 27" model. Mid-2011 3.4Ghz Intel Core i7 with 4GB RAM and 1TB Harddrive. And ATI HD5450 1GB Graphics.

Help! 2010 imac 27" - Display doesn't work after long sleep

I just recently started having this problem. I've had this iMac since 2010 with zero issues, but it seems like ever since I downloaded Yosemite, the screen won't work after the computer has been sleeping for a while. I have to hold the power button and do a hard restart to get it to work again. If the computer has only been sleeping for a while, it wakes just fine. It's only after it's been sleeping all night and I go to use it agsin. I've checked power connections and all is good. Any ideas??

Hi Punisher8522,
Welcome to the Support Communities! The resource below offers some troubleshooting steps to try when your computer won't wake from sleep.
OS X: When your Mac doesn't sleep or wake - Apple Support
http://support.apple.com/en-us/TS5357
Your computer cannot wake from sleep
Make sure your computer isn't powered off by pressing the power key for one second.
If you're using an external display, make sure your display is not powered off or unplugged.
If you are using a Mac desktop:
Make sure the AC power cord is connected securely to the computer and outlet.
Make sure the AC power outlet it is connected to is working properly.
If your computer is plugged into a power strip, make sure the power strip is not turned off. Check to make sure other items connected to the power strip are receiving power.
Your computer is slow to wake from sleep
If you see a progress bar when you wake your computer from sleep, this is normal. The computer is waking from safe sleep.
OS X Recovery and sleep
The system software your computer uses when started from OS X Recovery allows display sleep. Your computer does not go to sleep on idle while started from Recovery unless you are using a Mac notebook that is not connected to AC power.
Additional troubleshooting
If the steps above do not resolve your sleep-related issue, try these additional recommendations.
Reset SMC
The System Management Controller (SMC) is involved in managing power on your computer. Reset the SMC on your Mac if you are having difficulty sleeping or waking your computer.
Reset NVRAM/PRAM
Nonvolatile RAM (NVRAM)/Parameter RAM (PRAM) stores some power-related settings.Try resetting NVRAM/PRAM if you are having difficulty sleeping or waking your computer.
Test with external devices disconnected
Some external devices can prevent your computer from sleeping. Try disconnecting items other than your Apple keyboard or mouse from the built-in USB, Thunderbolt and Firewire ports on your Mac. If this resolves the issue, try reconnecting your external devices one at a time until you find the device preventing sleep or wake. Check the documentation that came with the device, or contact the device manufacturer for more information.
Try Safe Mode
Check to see if the issue still occurs when the computer is started in Safe Mode. If this resolves the issue, it could be related to a third party software item such as:
a login item
a startup item
a third party kernel extension
Try another user account
Try creating another user account, or log in as guest. See if your computer sleeps and wakes properly from the additional user account. If it does, your issue may be related to one of the following:
a login item
an app open in the original user account
You can disable login items from the Accounts pane of System Preferences. Try opening only one app at a time in the original user account to determine which app is preventing sleep. If you isolate the issue to a particular app or login item, check its documentation, or contact the developer of that software for more information.
Last Modified: Sep 19, 2014
I hope this information helps ....
- Judy

Mid 2010 iMac HD Proximity Sensor not working

I'm using a mid 2010 iMac and until yesterday iStat showed a temperature for HD Proximity Sensor. But today, iStat just showed a dash ("-") next to the HD Proximity Sensor reading. After I restarted my iMac, HD Proximity isn't even there on the list and all I see is this:
These are all idle temperatures by the way. Did that sensor just stop working for some reason? And if so, what can/should I do about it?

Let it cool for an hour or so, then...
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964

HT1661 Target disc mode not working

My target disc (Macbook Pro) shows the firewire icon but nothing shows up on the host (PowerMac). I've tried several different ways and enabled it to show up in preferences. I don't have any other firewire device plugged in. I'm using a brand new cable. Thanks

cherylfromvenice wrote:
The cord was a very inexpensive one I got on Amazon. Could that be it?
It's certainly possible. Anything else you could try it on?
Also, there is only about 4MB of storage left on the host hard drive, though that shouldn't keep the target drive from showing up.
4MB??? I've never seen a situation like this, but I suspect it could indeed prevent the Target from showing up. The Host needs some overhead to make things work.
I'm running 10.4.11 on the host and Snow Leopard on the target.
I was going to suggest running Software Update on the Host, but with only 4MB of space, it couldn't install anything anyway.
The target is so full it won't show me anything but Safari, not even the finder, but it is going into target mode every time no problem.
Well, that kills my other idea. I was going to suggest switching Host and Target around.
At this point, I'd suggest getting some external storage so you can offload at least 10-15GBs (ideally, you never want to go under 15% free space available). Then try again.

Target Display Mode on late 2013 27" iMac to mid 2010 27" Imac

Hey guy's real strugling to make my 2010 imac become a display, When i connect my 2010 cinema display 23" everything works fine but the minute i try to enable the tdm function on the 2010 imac nothing happen. Like nothing I got the mini display to thunderbolt adapter but nothing happen with the imac.
Any help or suggestion is very welcome.

Target Display Mode 2009 & 2010 iMacs
Target Display Mode And Thunderbolt
iMac- How to use your iMac as a Target Display Mode display
iMac (Mid 2011)- Target Display Mode does not work with Mini DisplayPort cable

Use iMac in Target Display Mode with a Power Mac G4

I would like to connect my Power Mac G4 MDD (Model = http://support.apple.com/kb/SP63) to the new iMac (27 inch, Mid 2010) in Target Display Mode. That is, I want the new iMac to be the display for my Power Mac G4. Has anybody done this (including using the iMac 27 inch, Late 2009, which can also do this)? In a general sort of way, this sort of thing is described on this support page: http://support.apple.com/kb/ht3924.
The problem: The iMac requires a Mini Displayport connection. The PowerMac has ADC and DVI-I display connections and also came with an adapter for converting DVI-I to VGA. How can I convert/adapt to get the appropriate Mini Displayport connection?
Gefen makes a converter (http://www.gefen.com/kvm/dproduct.jsp?prod_id=8913) that will convert DVI-D to Mini Displayport, but the description explicitly says that it will work with DVI-D only while my PowerMac has DVI-I. I know that these are two different, incompatible connections.
Is there another converter that works with DVI-I? Or is there a way to adapt from DVI-I to DVI-D? Or how about a VGA or ADC to Mini Displayport converter?
Thanks.

japamac-
Thanks so much for your reply. You're right on target for what I'm looking for and that article is VERY helpful! If you don't mind, I do have a couple more questions/clarifications.
1) First, I think that I didn't read the Wikipedia reference concerning DVI (http://en.wikipedia.org/wiki/DigitalVisualInterface) closely enough. It includes the following paragraph. If I understand it and what you said, it shouldn't be a problem to connect the male DVI-D of the converter into the female DVI-I socket of my Power Mac. Right?
+The long flat pin on a DVI-I connector is wider than the same pin on a DVI-D connector, so it is not possible to connect a male DVI-I to a female DVI-D by removing the 4 analog pins. It is possible, however, to connect a male DVI-D cable to a female DVI-I connector. Many flat panel LCD monitors have only the DVI-D connection so that a DVI-D male to DVI-D male cable will suffice when connecting the monitor to a computer's DVI-I female connector.+
2) I'm not clear on the difference between the Altona AT-DP200 and the Gefen converter. The Gefen converter is somewhat less expensive, so I'm trying to figure out what the downside is. The article you mentioned says that the ATP-DP200 "doesn't scale images", but that seems to only be an issue if I'm trying to connect other devices (PS3, Blu-ray), not if I just want to connect my Power Mac.
The description of the Gefen converter includes the following drawbacks:
+The only major drawback to Gefen's solution is no support for VGA devices or HDCP. A minor gripe would be the fact that the Gefen device only accepts one input resolution and only outputs one resolution (1920 x 1200 at 60 Hz). These limited options aside, the Gefen device looks like it could do the basic trick of transforming a DVI signal to Mini DisplayPort so that you could use your 27" iMac for a few more purposes, provided that the input signal carries the required 1920 x 1200 resolution.+
I'm not clear on what the practical impact of those limitations would be. I don't think the the lack of support for VGA devices or HDCP is an issue for my application. But I'm wondering about the statement that it only accepts one input resolution and outputs only one resolution (1920 x 1200) and the need for the input signal to carry 1920 x 1200. I take it, first of all, that the Power Mac can supply that input resolution. And, what is the impact of the device only having that resolution output to the iMac screen? That is, how would that look on the screen, ugly or okay? Finally, would the Altona device provide a better looking output on the iMac screen because it can apparently handle different resolutions? The manufacturer's description says, "Resolutions: all resolutions up to 1920x1200 (It is Important to select one of the resolutions that display
is capable of displaying, refer to your display’s users manual)."
Thanks again.

2010 iMac Target Display Mode not working

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