Had same problem. Has nothing to do with screen resolution. I had accidentally pressed the 1st button above the power button on my Dell U2311H Monitor while tilting it. Holding this button for >10 seconds toggles if from "Lock" to "Unlock". Simply hold button to either lock/unlock.
Padlock overlay icon in the middle of my screen
Anonymous
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Ideas:Overlay Padlock icon
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Anonymous
2016-05-12T14:41:14+00:00 -
Anonymous
2017-12-18T01:23:59+00:00 thank you
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Anonymous
2010-06-11T14:23:10+00:00 Got a Dell LCD monitor?
http://www.paulstravelpictures.com/Dell-LCD-Monitor-Flashing-Padlock-Icon/index.htm
MS-MVP - Elephant Boy Computers - Don't Panic!