Detect computer power state

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Is there any way for the Teensy to detect the power state of an attached computer? I have a TV that I am using as a computer monitor, and it doesn't support power management over HDMI, so I figured I would make something to turn it off when the computer turns off and on when the computer turns on. I'm ok with writing an application to run on the computer too if need be, but it would be a lot more convenient if that wasn't necessary

Thanks
 
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