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Electron Blue IV monitor: wrong mirror display with Mac 10.5.5

Under Tiger, my monitor properly mirrored the Powerbook's desktop.  Now the monitor imposes a Mac startup screen on the desktop of my new Macbook Pro.  Solution?

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Is the mirroring still taking place or just on the one display.  If it just on the Macbook, go to the display settings and select the arrangement button, there should be a mirror button there.

Posted on Oct 17, 2008

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Posted on Jan 02, 2017

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Stop one mac screen from becoming multiple screens


Mirroring displays the same image on each display.
  1. Make sure your additional display is properly connected and powered on.
  2. From the Apple (?) menu, choose System Preferences.
  3. From the View menu, choose Displays.
  4. Click the Arrangement tab.
  5. Enable (check) "Mirror Displays" in the bottom-left corner.
In the example below. the blue boxes represent each display that is connected. The white bar at the top of both boxes represents your menu bar and is shown on both displays when they are showing the same information.
lion_mirror_displays.png
When mirroring, your Mac attempts to match the closest resolution between the primary (or built-in) and secondary displays.
lion_display_resolution.png
The usable resolution is the closest matching resolution for both the primary and secondary display. If you choose a resolution that is not supported on both displays, OS X reverts to using the closest matching resolution.
lion_close_match_resolution.png
Extended desktop With extended desktop, your displays are treated as one, continuous desktop.
  1. Make sure each display is properly connected and powered on.
  2. From the Apple (?) menu, choose System Preferences.
  3. From the View menu, choose Displays.
  4. Click the Arrangement tab.
  5. Disable (uncheck) "Mirror Displays".
In the Displays pane of System Preferences, each blue box represents a display that is currently connected. The size of each box is relative to the current resolution of the display it represents. In the example pictured below, the larger box on the left represents an Apple 27" Thunderbolt Display, while the smaller box on the right is the built-in display of a 13" MacBook Air (Color LCD).
The white bar at the top of the left blue box represents the menu bar you see at the top of your display. Menu bar placement determines which display is treated as the primary display in OS X. To change your primary display, click and drag the white bar from one blue box to another.
You can also drag any of the blue boxes to change a display's represented location. Use this feature to make sure the connected displays match their real world location when navigating your desktop.
lion_mirror_change_display.png
As shown below, each display retains its maximum resolution setting as they are operating as individual displays showing a continuous desktop.
lion_display_max_resolution.png
lion_choose_max_resolution_.pngPress Command-F1 to toggle between video mirroring and extended desktop
Press Command-F2 to detect displays

May 01, 2014 | Apple 24" iMac Desktop

1 Answer

My mac Pro Desktop mirrors the monitors all by itself. It also turns the volume up and down by itself. Is this hacked??


Have you checked or unchecked the turn mirroring on in display preferences? Sound output settings: be sure you are set for internal speakers and not one of the other options (unless you are using USB or some other output device). This is not a hack: Hackers want to use your machine to send email or style your data. They don't care about monitors.
Also try repairing permissions in disc utility, and then repair the disc. If that fails, run Disc Warrior and clean up the system.

Jan 23, 2013 | Apple Mac Pro 8-Core Desktop Computer...

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I am trying to connect my PowerBook G4 to an external display. The external display is my new Vizio HDTV. I am using the DVI port output through an adapter to HDMI and plugging the HDMI cable into the...


One possibility is that you don't have your TV set to the right input, check to make sure that your TV is on HDMI 1 (or whichever channel your laptop is plugged into). If that doesn't fix your issue, go system preferences > displays and then from there you can assign the TV as a mirror of your desktop or a second monitor.

Feb 04, 2011 | Apple PowerBook G4 Mac Notebook

1 Answer

I have a LiCie electron Blue crt monitor. I have


You have a bad connection or break in the wiring. Fix that and your monitor will work properly. Could be the wire itself or the plug you use to plug into.

Mar 05, 2017 | LaCie Electron III 22" CRT Monitor

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PowerBook G4 15" 1.25 GHz - The native resolution (1280x854) does not show up in my monitor preferences. The highest listed is 1152x768. I reset the PRAM and NVRAM but still no change. Any ideas? Here is...


According to the specs you listed here, max resolution for your LCD panel is 1152 x 768. If you plug into an external monitor you should be able to get 1280 x 854,

Nov 30, 2009 | Apple PowerBook G4 Mac Notebook

1 Answer

Connecting laptop to lcd


You may need to use the S-video cable for video. Make sure video mirroring is disabled on the powerbook. Also, make the external monitor the primary display by dragging the menu bar to it in Displays preferences (Mac OS X) or the Monitors control panel (Mac OS 8 and 9).

Mar 14, 2009 | LG 32LG30 32 in. LCD HDTV

1 Answer

Macbook & Projectors


Hi there
Yep, sounds like the machine thinks it is an additional monitor. So you can run it as that but the mirroring does not work. So the mirroring works with your own projector?

There are a couple of things you can do. Try connecting the projector and power it up when you machine is off and then boot your machine up. If the mirroring still does not work open up your display panel look under arrangement. You should then see two displays. One will have a red line around it. That is your laptop. In the display panel you can then drag the second display over your display and that should have the same effect as mirroring.

That's the low tech first try.

Sep 19, 2008 | Apple MacBook 13"White /2.0Ghz Intel Core2...

2 Answers

Compatible with Mac?


I have the same problem.  Did you find a solution or just return it?

Jul 21, 2008 | Hannspree 22" widescreen LCD Flat Panel HD...

1 Answer

Maxent as PC monitor


Most likely you haven't set it up as a mirrored display. Try dragging your mouse off the edges of the original dispay (or laptop screen) and see if it shows up on the plasma, if it does, figure out of to mirror. Im not sure how to go about mirroring the display on windows, but on mac its an option in the display drop down menu.

Mar 16, 2008 | Maxent MX-42HPM20 42 in. Plasma HDTV

1 Answer

LaCie 10 CRT


I would try booting the computer in safe mode (if it's windows) and adjust your display settings. It sounds as though it is trying to display from your computer something that it cannot properly.

Mar 28, 2007 | LaCie Electron IV 19" CRT Monitor

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