Desktop background not changing.

Do a backup, preferably 2 backups on 2 separate drives.

Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library. Then go to Preferences/com.apple.finder.plist and com.apple.desktop.plist. Move the .plists to your desktop.

Re-launch Finder by restarting the computer and test. If it works okay, delete the plists from the desktop.

If the same, return the .plists to where you got it from, overwriting the newer one.

Thanks to leonie for some information contained in this.

Hello Dipsum,

Please give us more details. How is it not working? Does the Desktop settings not open at all? It will all depend on that.

Here are some links that might help you resolve this issue:

http://apple.stackexchange.com/questions/61771/why-cant-i-change-my-desktop-back ground

macbook pro can't change wallpaper

Hope it helps,

Littered.

Hello Dipsum,

I am not very much aware of the security softwares. Also, I am not very sure about what you had done with the changing the wallpaper. But it seems like you didn't do it this way.

Change Desktop Background (Another Way):

Preferences >> Desktop & Screensaver >> Desktop >> Drag a picture from the desktop that you want to make into the wallpaper.

Detailed Instructions:

http://appletoolbox.com/2014/03/mac-os-x-how-to-change-your-desktop-background-w allpaper/

I'm sorry if the case was that you did it that way. I couldn't understand properly.

Hope it helps,

Littered.