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Message: <blockquote data-quote="Scythe42" data-source="post: 941783" data-attributes="member: 95833">Windows has an API for detecting power state of connected devices, including displays. So this is not a biggie. Works since XP (if I am not mistaken even since 98SE). Doesn't matter how it is connected. Part of the Power Mangement APIs. Work for all devices. Not so easy to find if you look for HDMI displays. But it works fine as it can check the state of all connected devices form an Win point of view. If it is turned off and not because of suspending we can trigger an event.</blockquote>