Use iMac as external display for MacBook Air

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Use iMac as external display for MacBook Air

Hi, not sure whether or not this belongs here or in the iMac section. Regardless, I have a new MacBook Air and I am trying to use my 2009 27" iMac as an external display. I have a MiniDisplay connector plugged into both. When I press Command-F2, my iMac's screen goes dark, and my MBA's screen goes blue.

MacBook Air (13-inch Mid 2013), OS X Mountain Lion (10.8.4), 8 GM Memory, 512 GB

Posted on Jun 17, 2013 11:19 AM

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Answer 1

mario49

Community Specialist

Jun 19, 2013 9:52 AM in response to sflomenb

Morning sflomenb,

Thanks for using Apple Support Communities.

For troubleshooting on this, take a look at this article:

Intel-based Macs: Resetting the System Management Controller (SMC)

http://support.apple.com/kb/ht3964

Video

A computer that supports target display mode does not switch into or out of target display mode as expected.

For more information on this, take a look at this article:

Target Display Mode: Frequently Asked Questions (FAQ)

http://support.apple.com/kb/ht3924

Make sure both Mac computers are turned on and awake.

What are the requirements for TDM?

A Mac notenook or desktop with a Mini DisplayPort or ThunderBolt connection
A ThunderBolt or Mini DisplayPort cable
A supported iMac with OS X 10.6.1 or later.

Best of luck,

Mario

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