Answer for:

Asus Monitor

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I agree with Scalloway1. This sounds like a control panel setting (the fact that moving the mouse wakes it up is a giveaway that it's a setting and not the monitor beginning to die, and the fact that it only does it when left idle is another strong indicator).

You haven't mentioned which power settings you've checking in the control panel. It's not just the 'Turn monitor off after' setting you need to check. You also need to check the 'Sleep after' option, as some PCs wake from sleep on mouse movement. Also check the screensaver option. While testing, I'd turn all three of these off completely.