Dell Monitors keeps turning itself off

[Nez477]

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While the screen is "off", does the Menu button still bring up the menu? If you switch monitors with a friend, who keeps the problem?

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No, the menu button does not work. If I unplug it from the computer even, and plug it into a separate outlet, when I turn the monitor on, the "test" box comes on in the corner and starts moving and then the screen goes black again.