Thunderbolt port 2 works, but Thunderbolt port 1 does not.
My MacBook Pro recently had its logic board replaced by Apple. Since the replacement, the second thunderbolt port works perfectly. But the 1 port does not.
If I use an official Thunderbolt to VGA or Thunderbolt to Ethernet cable, nothing happens. I have tried different displays and Ethernet devices. They all work in port 2, but not in port 1.
Somtimes, using the Thunderbolt to VGA adapter in the 1st Thunderbolt port will make the Mac freeze until the cable is unplugged (This does not happen in the second port).
The Apple store ran diagnostics on it and replaced the flexible cable. But the issue still remains. They are adamant that it works. All their diagnostics software confirms that it is working as well.
(I am unable to go to the store and so have the Mac delivered by courier, which is why I cannot check it before leaving the store).
Any idea what the issue could be? Thanks!
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