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Question: Thunderbolt No hardware was found

Since the installation of High Sierra 10.13.1 on my iMac 27inch Late 2013, I can't no more connect to my Audio Interface Apollo Twin which is directly connected to my iMac via Thunderbolt.

When I try to connect, I get the Message "No Devices Found".

In my iMac System Report, under Thunderbolt, I get "No Hardware was found"

Looks as if my Thunderbolt ports are disabled?

I need help, some ideas?

Thank you,

Gilles

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Question: Thunderbolt No hardware was found