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>

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Is there a way to use the iMac's display mode with a Mac mini with out logging in first on the Mac mini

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This
Target Display Mode: Frequently Asked Questions (FAQ) - Apple Support
says:
How do I enable TDM?
Make sure both computers are turned on and awake.
Connect a male-to-male Mini DisplayPort or ThunderBolt cable to each computer.
Press Command-F2 on the keyboard of the iMac being used as a display to enable TDM.
Note: In Keyboard System Preferences, if the checkbox is enabled for "Use all F1, F2, etc. keys as standard functions keys," the key combination changes to Command-Fn-F2.
How do I exit TDM?
To leave TDM, press Command-F2 on the keyboard of the iMac that is in TDM. You can also exit TDM if you shutdown or sleep either computer or detach the cable.
Can I use a third-party keyboard or older Apple keyboard to enable TDM?
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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?

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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.
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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:
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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
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Hi Guys
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as a Mid 2010 27" iMac with MiniDisplay port.
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Both has Mountain Lion on them.
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When i plug in the MiniDisplayPort cable to both machines then
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Jan 11, 2013, 10:17 AM
#5
martinm0
macrumors 6502
Join Date: Feb 2010
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2010 iMac target display mode with 2013 Mac Pro

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