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.

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Jan 11, 2013, 10:17 AM
#5
martinm0
macrumors 6502
Join Date: Feb 2010
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<http://support.apple.com/en-ca/HT202801>
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Mid 2010 27" IMac Target Display Mode has stopped working

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