Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Why is the thunderbolt port not reading my FW External HD?

I have an Apple Thunderbolt to Firewire 800 adapter that I use to plug in an external hard drive. When connected and the HD is turned on it does not show up on my system or system profiler.

However when I used the same adapter and ext. HD on my Macbook Air, the drive shows up without any issues.

I have tried to reset the system by unplugging all connections included the plug itself and holding the power button for 20 seconds then rebooting but this has not helped?

Someone mentioned to me that it may be the logic board itself. Can anyone assist in resolving this issue?

Answered! View the answer I have this problem too

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Is the external drive Firewire 800 or Thunderbolt?


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Do you have access to another Thunderbolt device to connect to your system?

I would start there to double check your systems port. If it is working then its likely a driver issue, otherwise the adapter may not be fitting correctly.

If the other device also fails to work then you do have a bad logic board.

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Yes, I tried it on my Macbook Air and the external drive showed. Same settings. Thunderbolt to Firewire800 Adapter. It is still under warranty so I'm taking it in for repairs.


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Rondell will be eternally grateful.
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