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do not use this device
My daughter played smart and messed up the monitor. She went to settings-advanced-monitor tab-properties and there she changed to "do not use this device. Now the monitor is blank. Thanks to her. I went to bios and played with the available options. Nothing works so far. The video card is built-in on motherboard. The question is: how we could restore the monitor to "use this device".
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Try uninstalling the video device in Device Manager while in Safe mode, then reboot back into normal mode.
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the screen is blank safe mode or regular mode. I used the disk I created to boot another pc for which I created an image. It booted the cursed pc and I could browse folders. This is as far as I could go.
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Which Operating System and version?
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IF you could boot you could try a System Restore (provided you have an O/S that supports it and actually have some restore points).
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You could also likely use another monitor that it has not been attached to before to reset it