Second LG Monitor Doesn't Connect After Recent OS Update

I have two LG BK550Y monitors, one connected via HDMI and the other via a USC-C to HDMI cable. My MacBook Pro has a M2 Pro chip and supported both monitors (and the laptop screen) just fine up until the recent Sequoia update.


I've tried power cycling the computer, the monitors, and I even reset the monitors to factory settings. If I only connect one or the other monitors, regardless of the connection type, the laptop will see it. As soon as I connect the second one though, the MacBook only shows the monitor connected to the HDMI port.


Because I can connect just the USB-C port monitor and the HDMI monitor, I know the hardware on both and cable connections are good independently. Again, this only became a problem with the update a couple of weeks ago.


Any advice?




MacBook Pro 14″, macOS 15.6

Posted on Aug 27, 2025 03:01 PM

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Second LG Monitor Doesn't Connect After Recent OS Update

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