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Apr 12, 2015 1:27 PM in response to georgefrompretoriaby mario49,Hi georgefrompretoria,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like you are getting 3 short blinks when using an Apple LCD display. I would recommend that you read this article, it may be able to help the issue.
Apple LCD displays: Power light flashes - Apple Support
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.Cheers,
Mario
