pleas read this: Apple LCD displays: Power light flashes
maybe it helps to find the problem
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edit:
since it's to "problematic" to recognize a common html link, i post the information wrote on the apple support page.
Pattern: short, short, short
Meaning: 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.
Pattern: short, long, short
Meaning: 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.
Pattern: short, short, long
Meaning: 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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