Apple Display Error Codes

Source: http://support.apple.com/kb/HT2811

Apple Cinema Displays use their power LED (lower right corner) to tell you about problems. The LED will flash in a certain pattern (a bit like morse code). Here are some common error codes:

Pattern Meaning
short, short, short The display is detecting wrong video format or an unsupported resolution. Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM. After resetting the PRAM, if you still see this error, shut down the computer, power cycle the Cinema Display, and turn on the computer.
short, long, short Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter.
short, short, long The display is detecting a backlight error. Check your display's power connections and restart the computer. If the problem continues, contact Apple or an Apple Authorized Service Provider.
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