My 27 inch iMac late 2012 model doesn't recognize its thunderbolt ports any more after I upgraded OS X to 10.10.5, currently 10.13.6. The System report states "Thunderbolt: No hardware was found." The thunderbolt ports were last recognized by 10.10.3.
I did SMC and PRAM. Self diagnose test passed at least twice. The third time running it (at the request from Apple support) the cooling fan in iMac spinning crazy. I aborted the test. Not sure this is problem or not. Does the cooling fan spins crazy during self diagnosis? It didn't in the first two times.
There was one post at other forum talked about install Thunderbolt firmware 1.0. It was not working for me, as the OS X indicated it won't support. By the way, currently, the thunderbolt firmware 1.2 is installed, but the software update keeps sending it back to the list to be installed again. It is a never ending cycle.
How to make OS X recognize its thunderbolt ports? Many thanks
I did SMC and PRAM. Self diagnose test passed at least twice. The third time running it (at the request from Apple support) the cooling fan in iMac spinning crazy. I aborted the test. Not sure this is problem or not. Does the cooling fan spins crazy during self diagnosis? It didn't in the first two times.
There was one post at other forum talked about install Thunderbolt firmware 1.0. It was not working for me, as the OS X indicated it won't support. By the way, currently, the thunderbolt firmware 1.2 is installed, but the software update keeps sending it back to the list to be installed again. It is a never ending cycle.
How to make OS X recognize its thunderbolt ports? Many thanks