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Sorry, the problem has been solved.
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I've requested that this question be closed as follows:<br />
<br />
Accepted answer: 0 points for mallony's comment <a href="https://www.experts-exchange.com/questions/28867639/HP-Compaq-LA2306x-Black-23-not-duplicating-monitor-black-but-ON.html?anchorAnswerId=41298868#a41298868" rel="ugc">#a41298868</a><br />
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for the following reason:<br />
<br />
The issue is solved.
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Then tell us how it was resolved or delete the Question.
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I have download the monitor driver again and reinstall it. That has solved the problem.
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You are right. Rindi's comments answers my question. Sorry, i didn't realize it. But thanks for the guidance.
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<div class="content wysiwyg-content">
Hi,<br />
<br />
I have a monitor from HP Compaq LA2306x Black 23&quot; 5ms Widescreen WLED Backlit LCD Monitor 250 cd/m2 1000:1 &nbsp;which is connected to my HP laptop Elitebook 820 G2 through a Utraslim docking station and the monitor it is ON but i cannot make it the monitor to duplicate the screen as it was before. i have done some update but nothing make the screen works. I only see it the black screen despite i can see the menu when press the menu Botton.<br />
<br />
Can you please advice?
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Hi,

I have a monitor from HP Compaq LA2306x Black 23" 5ms Widescreen WLED Backlit LCD Monitor 250 cd/m2 1000:1  which is connected to my HP laptop Elitebook 820 G2 through a Utraslim docking station and the monitor it is ON but i cannot make it the monitor to duplicate the screen as it was before. i have done some update but nothing make the screen works. I only see it the black screen despite i can see the menu when press the menu Botton.

Can you please advice?

HP Compaq LA2306x Black 23&quot; not duplicating - monitor black but ON

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.

HP Compaq LA2306x Black 23&quot; not duplicating - monitor black but ON

HP Compaq LA2306x Black 23" not duplicating - monitor black but ON