This may be an issue with the display detecting the wrong video format or is using an unsupported resolution for this Apple Cinema Display 22"
Procedure:
• Make sure your Mac is turned off.
• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Now, hold the keys down until the computer restarts and you hear the start up sound for the third time.
• Release the keys and allow the Mac to start up.
If that does not help here is additional support reference from Apple regarding its LCD displays:
Apple Support Link:
Power Light Flash IssuesLet me know if this helps!
Regards,
-Mactechtrainer
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