Cinima 20 Display at startup - desktop picture is fine then darkens

When I restart my computer, my background picture fills the screen and it looks like it always did before it quickly changes. After an instant the picture changes by darkening. I have no idea why, but it just started to happen. I have been digging to try and figure this out, but have not found anything yet. Any assistnace would be greatly appreciated.

Could either be the power supply (the brick) or the backlight circuit board. Can you bring the brick to an Apple store to test it? If the brick works fine, then you will have to return the display to Apple.

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Okay, thanks Barney. I seem to be able to add and subtract individual pictures in the default folders, but (as you said) I can't add more folders to the main library folder. I was just trying to keep all of my desktop picture categories in one place, but as it is now I'll have to be happy with two places. I keep the majority of my photos in my user/pictures/"more desktop pictures" folder - and then I add them in using the + button. I do find it annoying that they show up in a different section (below iPhoto) in the system preferences window. Oh well.
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Hello Everyone.
I upgraded an iMac 27" (3.4 Ghz, Intel Core i7, 3TB fusion) from Mac OS X 10.8.6., to Mac OS X 10.9.3 a few days back.
Ever since then, the 2nd user to login on a given day, gets the dock displayed near the middle of the screen. It still interacts OK (e.g. you can launch applications from there), but it is not in it's correct location. The desktop picture (in this case, a shade of solid dark grey), only covers the smaller desktop area (up to where the Dock is). The remaining area of the screen automatically gets a 'light grey' background colour.
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Hi folks.
I found a solution...Looks like the Dock is the culprit it's self. So, I made an automator app that I fire up automatically at login time. The automator app runs a shell script command:
killall Dock
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Enjoy.

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Hi Becki514,
Welcome to the Support Communities!
The following articles may help you with your projector issue:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/ht3382
Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external display
http://support.apple.com/kb/ht3131
I hope this information helps ....
Have a great day!
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Cinima 20 Display at startup - desktop picture is fine then darkens

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