BeRay

Level 1 (0 points)

Q: Target Display Mode (TDM)

ISSUE: Target Display Mode (TDM) is not activating when pressing CMD + F2 or CMD+FN+F2

COMPUTER 1 = iMac (27-inch, Mid 2011) version10.11.3 (15D21) (El Capitan)

COMPUTER 2 = MacBook Air (11-inch, Early 2014) Version 10.11..3 (15D21) (El Capitan)

CABLE: Thunderbolt Cable

Cable doesn't seem to be fault because it displays active connection in Network settings under advanced = status active

Attempted:

Reset PRAM

Reset SBC

Posted on Mar 20, 2016 9:28 PM

I have this question too

Q: Target Display Mode (TDM)

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by OGELTHORPE,

OGELTHORPE Mar 21, 2016 3:55 AM in response to BeRay
Level 9 (52,147 points)

Mac OS X

Mar 21, 2016 3:55 AM in response to BeRay

Have you followed the sequence of steps as written in this support document?

https://support.apple.com/en-us/HT204592

Ciao.
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by BeRay,

BeRay Mar 21, 2016 11:32 AM in response to OGELTHORPE
Level 1 (0 points)

Mar 21, 2016 11:32 AM in response to OGELTHORPE

Yes I have already followed the sequence of steps as written in the document at Use your iMac as a display with Target Display Mode - Apple Support. The computer do not respond to any key combination nor does the computer even flicker when cables are attached.
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by OGELTHORPE,

OGELTHORPE Mar 21, 2016 12:22 PM in response to BeRay
Level 9 (52,147 points)

Mac OS X

Mar 21, 2016 12:22 PM in response to BeRay

Did you reset the NVRAM in the MBP and the iMac?

https://support.apple.com/en-us/HT204063

If no success. the best option is an appointment at an Apple store genius bar for a FREE evaluation.

Ciao.
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by BeRay,

BeRay Mar 21, 2016 1:18 PM in response to BeRay
Level 1 (0 points)

Mar 21, 2016 1:18 PM in response to BeRay

NVRAM reset is performed in the same way as NPRAM. So yes I have already coincidently reset both NVRAM & NPRAM.
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by BeRay,

BeRay Mar 21, 2016 3:51 PM in response to BeRay
Level 1 (0 points)

Mar 21, 2016 3:51 PM in response to BeRay

Called apple support, They recommended that I had a bad cable. I went to the store and purchased another cable. I am still having the same issue.
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by OGELTHORPE,

OGELTHORPE Mar 21, 2016 4:02 PM in response to BeRay
Level 9 (52,147 points)

Mac OS X

Mar 21, 2016 4:02 PM in response to BeRay

As I alluded to before, make that appointment at the genius bar and bring the hardware with you. I cannot see a software solution based on what you have posted.

ciao.
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by kcfromsan francisco,

kcfromsan francisco Apr 22, 2016 2:45 AM in response to BeRay
Level 1 (4 points)

Apr 22, 2016 2:45 AM in response to BeRay

MBA = Mid-2011 Yosemite, iMac = Mid-2011 El Capitan.
After upgrading to El Capitan for iMac, I manage to perform TDM without any issue.
Leaving both MBA and iMac over night, went into sleep mode.
The next day, it doesn't allow me to perform TDM.

So I upgraded El Capitan on my MBA.
Unfortunately its still can't TDM

Can't be the cable when it was able to do so the day before.

Thank you
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