2013 iMac won't recognize Thunderbolt Display

T

technopimp

macrumors 6502a

Original poster

Aug 12, 2009

645

220

• Nov 18, 2014

• #1

I have a 2013 27" iMac. I've been trying to plug in my TB display, but it just refuses to "light up". It works 100% of the time connected to either of my other MBP's, but the iMac just won't activate it. I've tried rebooting with it connected, etc. Is there a special "trick" I have to use to get it to come up?

 

C

crsh1976

macrumors 68000

Jun 13, 2011

1,693

2,034

• Nov 19, 2014

• #2

In the Display system preference panel, when you hit Option+click there should be a "Detect Displays" button, it does nothing?

Otherwise, Apple Support says to disconnect peripherals, zapping the PRAM and reconnect things afterwards to see if it fixes the no signal thing.

 

jdphoto

macrumors 6502

Jan 13, 2014

328

121

• Nov 19, 2014

• #3

Have you also tried both Thunderbolt ports? Maybe one has gone bad?

 

T

technopimp

macrumors 6502a

Original poster

Aug 12, 2009

645

220

• Nov 19, 2014

• #4

crsh1976 said:

In the Display system preference panel, when you hit Option+click there should be a "Detect Displays" button, it does nothing?

Otherwise, Apple Support says to disconnect peripherals, zapping the PRAM and reconnect things afterwards to see if it fixes the no signal thing.

Click to expand...

Correct. I hit it and nothing happens.

And yes, tried both TB ports. I have other TB peripherals so I know they both work.