After changing out my Mackbook screen and updating the OS to Sierra the display is way too bright even on the lowest setting. Im not sure why it is so bright but it isn't normal. I thought I could change some of the settings from the Displays preference pane in system preferences, but when I click on it I get this error: Preferences Error Could not load Displays preference pane. Has anyone got any suggestions as to why the screen is so bright and why my Displays preference pane is not working? Appreciate any help, Thanks.