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<blockquote data-quote="pigoo3" data-source="post: 1939952" data-attributes="member: 56379">Thanks much for the extra details.&nbsp; Yes that makes sense that some items might get &quot;lost&quot; on that 2nd display...when that 2nd display is turned off/not in use.This is an unusual way to do things.&nbsp; Usually if someone has multiple displays connected to a computer...usually all connected displays are powered on &amp; in use.&nbsp; If one or more monitors are not needed...then they are disconnected.I'm guessing you want to turn off the 2nd display when not in use...either to save on electricity...save on wear &amp; tear on the display...or a bit of both.&nbsp; Both are good reasons.I think normally/most users...the non-used display would be disconnected from the computer (disconnect the video cable)....don't need to disconnect the power cable.But let's assume the &quot;Screen Mirroring&quot; feature can be used as a solution in this case. Looking at the &quot;Display&quot; System Preference...make sure the single display you normally use is set as the &quot;Main Display&quot;...then set the 2nd (powered down display)...to mirror the main display.&nbsp; Make sure in the list of options...that the 2nd display is mirroring the &quot;main display&quot;.Here's a screenshot of what I'm referring to:[ATTACH=full]39137[/ATTACH]In the screenshot...my main display is the AL2223W...and the HP w2408 is an &quot;Extended Display&quot;.&nbsp; If I wanted to turn off/power down the HP w2408...then I would want to select the &quot;Mirror for AL2223W&quot; option.Please give this a try...see if it works.&nbsp; Depending on the macOS version...the interface my be different (I'm running macOS 12.4 Monterey).If this doesn't work...to avoid the issue...I'm thinking the 2nd display needs to be powered on all the time...or the video cable for the 2nd display needs to be disconnected (when the 2nd display is not being used).Good luck,- Nick</blockquote>

[QUOTE="pigoo3, post: 1939952, member: 56379"] Thanks much for the extra details. Yes that makes sense that some items might get "lost" on that 2nd display...when that 2nd display is turned off/not in use. This is an unusual way to do things. Usually if someone has multiple displays connected to a computer...usually all connected displays are powered on & in use. If one or more monitors are not needed...then they are disconnected. I'm guessing you want to turn off the 2nd display when not in use...either to save on electricity...save on wear & tear on the display...or a bit of both. Both are good reasons. I think normally/most users...the non-used display would be disconnected from the computer (disconnect the video cable)....don't need to disconnect the power cable. But let's assume the "Screen Mirroring" feature can be used as a solution in this case. Looking at the "Display" System Preference...make sure the single display you normally use is set as the "Main Display"...then set the 2nd (powered down display)...to mirror the main display. Make sure in the list of options...that the 2nd display is mirroring the "main display". [U]Here's a screenshot of what I'm referring to:[/U] [ATTACH type="full" alt="Mirror 2.png"]39137[/ATTACH] In the screenshot...my main display is the AL2223W...and the HP w2408 is an "Extended Display". If I wanted to turn off/power down the HP w2408...then I would want to select the "Mirror for AL2223W" option. Please give this a try...see if it works. Depending on the macOS version...the interface my be different (I'm running macOS 12.4 Monterey). If this doesn't work...to avoid the issue...I'm thinking the 2nd display needs to be powered on all the time...or the video cable for the 2nd display needs to be disconnected (when the 2nd display is not being used). Good luck, - Nick [/QUOTE]

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