As a result of this, the keyboard function to toggle TDM off (CMD+F2) is unavailable to the user. For whatever reason when the iMac switches to TDM mode, OS X considers this to be a ‘sleep’ operation and thus locks the underlying OS. This setting is found in System Preferences > Security & Privacy.
OS X has a (sensible) security setting which forces the user to enter the default user password when the iMac sleeps or when the screen saver begins. Here’s the solution for those desperate to toggle their iMac both on as well as off. While the standard recommendation is to trigger a CMD+F2 on the iMac – in my case this was only working when turning on the mode and not when turning it off (disabling TDM on the iMac).įrustrated by this I researched a few blogs – yet to no avail. There is however a software issue which prevented the user from toggling the iMac in and out of TDM mode. This is known as ‘Target Display Mode” or TDM and is discussed in ample detail in this post.
When paired with a MacBook Pro (I have the Retina model) the iMac can be set to act as an external monitor (secondary monitor) for the MBP. The late 2013 iMac is a great piece of hardware – one of it key innovations is the thunderbolt connector.
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