Level 1 (4 points)

MacBook Pro M1 issue Using Thunderbolt T1/2 Monitor

I have MacBook Pro M1 that I have been using an older Apple Thunderbolt 1/2 monitor for a few years with an Apple T3 to T2 adapter. Yesterday the monitored stopped working. I connect the monitor to my older Intel based MacBook Pro and the monitor works as it should. I have replaced the adapter thinking it may have failed but have the same results. Anybody else have this issue and resolved it?

Posted on Sep 22, 2026 1:41 PM

4 replies

Grant Bennet-Alder

Level 10 (148,617 points)

Sep 22, 2026 2:46 PM in response to Jmaceross

if you have some reason to believe yours has failed due to problems with the captive lead-in cord’s Thunderbolt-2 connection, Users have successfully connected a discrete Thunderbolt-2 cable to the second Thunderbolt-2 port (on the chassis) and had the display work fine.

Grant Bennet-Alder

Level 10 (148,617 points)

Sep 22, 2026 2:05 PM in response to Jmaceross

<< Yesterday the monitored stopped working. >>

What else changed yesterday?

Grant Bennet-Alder

Level 10 (148,617 points)

Sep 22, 2026 6:36 PM in response to Jmaceross

<< the captive lead-in cord works on my older Intel based MacBook Pro. >>

then that is not likely your issue, as long as you have confirmed it working recently. Unfortunately, those cables are rare and therefore expensive.

Jmaceross Author

Level 1 (4 points)

Sep 22, 2026 5:41 PM in response to Grant Bennet-Alder

Thanks, I will give that a shot. But the captive lead-in cord works on my older Intel based MacBook Pro.

Originally posted at discussions.apple.com/thread/256362959