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I have a late 2011 mini and the HDMI out is set up to go to my receiver and thence to my TV. When the TV is off, I would like it not to extend my desktop to it, but it is. How can I prevent that other than plugging and unplugging the HDMI cable?

Update: covers similar ground to Best practices for 2011 Mac mini connected to monitor + HDTV?

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up vote 2 down vote accepted

I had the same problem, this happens because the TV is still sending a signal to the HDMI port even when powered off so the Mac still thinks that it's active. To solve this you need a HDMI switcher that will fully kill the HDMI signal when it's not used. Here is the one I use:

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Lol. From one of the reviews: "This is a very small plastic box that has an ominous connector for power. No power supply is provided. No matter. It works without it." – sprugman Feb 7 '12 at 18:13

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