Fix: Mac Menu Bar Icons Missing

If your Menu Bar icons in Mac X Yosemite suddenly start to disappear, you may have a corrupt System UI Server preferences file. Delete the file and reboot following these steps.

1. Open Mac X Terminal

2. Type:

rm ~/Library/Preferences/com.apple.systemuiserver.plist

then

killall SystemUIServer

3. Reboot your Mac.

Your menu bar icons should show up again and you rebuild the menu bar preferences file.