Tmcbride17 wrote:
Hi after upgrading to mac os high sierra i am unable to change my background image. Yes i have tried restarting the computer and tried changing the image many times. The background image stays blue no matter what it do.
MacBook Pro 13", macOS 10.13
Change the desktop picture (background) on your Mac - Apple Support
Customize the desktop picture on your Mac - Apple Support
If your issue continues with no resolve—Boot into Recovery (Command R) and from the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD. If errors are found and repaired, run again until no errors reported. Recovery: https://support.apple.com/en-us/HT204904
To trouble shoot further you can:
Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Go ahead and log-in.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
Test issue in another user (or guest user) account https://support.apple.com/en-us/HT204443
This will tell you if it a universal issue or isolated to your user/admin account.
If you still no resolve you can verify your macOS is up to date, reinstall the macOS from Recovery or try simply the Combo update: Download macOS High Sierra 10.13.6 Combo Update - Apple Support