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MarcMcClain · 01-30-2026, 10:04 PM

I'm having the same issue today. Rebooted today and after the latest Tahoe update, I can't have both my DP screen on along with my Thunderbolt HDMI output on my M1 MacBook Pro. Once I turn on the DP screen, the TB screen stops working or being seen by OSX and once it's off, the TB screen comes back. Can't have both on together now.

01-30-2026, 10:04 PM	#4
MarcMcClain Junior Member Join Date: Jan 2026 Posts: 1	Same here too I'm having the same issue today. Rebooted today and after the latest Tahoe update, I can't have both my DP screen on along with my Thunderbolt HDMI output on my M1 MacBook Pro. Once I turn on the DP screen, the TB screen stops working or being seen by OSX and once it's off, the TB screen comes back. Can't have both on together now.