LED Cinema Display (24-inch, Late 2008): Basic troubleshooting

If you are experiencing issues using your LED Cinema Display with your Mac, use the information below to help resolve the issue.

This article has been archived and is no longer updated by Apple.

Before performing any of these steps, make sure your computer is turned on, the display is plugged into an outlet, all the cables are connected properly to your computer and display, and your computer is not in sleep mode.

If the screen doesn't have an image:

  • Check the cables and connectors again to make sure they are connected properly to your computer and the display.
  • Make sure your computer is turned on and is not in sleep mode. If your computer's display is closed, use the external keyboard or mouse to wake the computer from sleep.
  • Reset the PRAM by restarting your computer while holding down the Command, Option, P, and R keys until you hear the startup sound a second time.

If the screen is dim:

Make sure the display brightness controls are set properly. Choose Apple () > System Preferences and select Displays. Drag the Brightness slider to adjust the brightness.

  • If the colors on the display are too saturated or incorrect, you may need to calibrate your display. Open the Displays system preferences, click Color, click Calibrate, and follow the instructions.

If your portable computer isn't charging:

Make sure the MagSafe connector from your display is seated properly in the MagSafe power port on your computer.

If the built-in iSight camera, microphone, speakers, or USB ports on the display are not working:

Make sure the USB cable from the display is firmly plugged into the USB port on your computer. The display's camera, microphone, speakers, and USB port work only when this cable is attached to your computer.

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