cinema screen comming up black with blinking light - 3 short blinks

Question

cinema screen comming up black with blinking light - 3 short blinks

When switching on my Mac Pro, the sceen stays black and the light stays on. When linking thr same screen with my Mac Book Pro the screen also appears black but the light blinks 3 short blinks

Mac Pro, OS X Yosemite (10.10.3), 30" Cinema Display

Posted on Apr 9, 2015 1:13 PM

Reply

Answer 1

mario49

Community Specialist

Apr 12, 2015 1:27 PM in response to georgefrompretoria

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

Reply

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.