They are plugged in to each other via USB-C on the Mac to the USB-C port on the monitor that support DP Alt mode. Monitor never detects anything and the Display settings on the Mac never recognize it no matter unplug-> replug in to any of the USB-C ports, nor after a restart. Any ideas?
MacBook Pro 16″
Hello _Roh,
If your MacBook Pro isn't recognizing your external display, start with these steps:
Check your cable or adapter
Disconnect the cable from your external display from your Mac, then reconnect it. If the cable from your external display doesn't connect to the ports on your Mac, you can use a USB-C or Thunderbolt adapter. If you're using a USB-C or Thunderbolt adapter to connect a display, the adapter must be compliant with DisplayPort Alt Mode or Thunderbolt / USB 4.
Check how many displays you can connect
If you're connecting multiple displays to your Mac, use the Tech Specs page to find out how many external displays your Mac supports.
1. Choose Apple menu > About This Mac, double-click your serial number, then press Command-C to copy it.
2. Go to the Tech Specs page, click the Search Tech Specs bar, press Command-V to enter your computer's serial number, then click Search.
3. Click the specs page for your Mac. The number of displays your Mac supports appears under Video Support or Graphics.
You'll find those steps here: If your external display isn't detected or appears blurry when connected to your Mac
You'll also want to check to be sure you don't need an adapter to connect your display to your Mac. This link will help you work through those steps: Use an external display with your MacBook Pro
Take care.
Hello _Roh,
If your MacBook Pro isn't recognizing your external display, start with these steps:
Check your cable or adapter
Disconnect the cable from your external display from your Mac, then reconnect it. If the cable from your external display doesn't connect to the ports on your Mac, you can use a USB-C or Thunderbolt adapter. If you're using a USB-C or Thunderbolt adapter to connect a display, the adapter must be compliant with DisplayPort Alt Mode or Thunderbolt / USB 4.
Check how many displays you can connect
If you're connecting multiple displays to your Mac, use the Tech Specs page to find out how many external displays your Mac supports.
1. Choose Apple menu > About This Mac, double-click your serial number, then press Command-C to copy it.
2. Go to the Tech Specs page, click the Search Tech Specs bar, press Command-V to enter your computer's serial number, then click Search.
3. Click the specs page for your Mac. The number of displays your Mac supports appears under Video Support or Graphics.
You'll find those steps here: If your external display isn't detected or appears blurry when connected to your Mac
You'll also want to check to be sure you don't need an adapter to connect your display to your Mac. This link will help you work through those steps: Use an external display with your MacBook Pro
Take care.
Please describe in detail what is plugged into what, and EXACTLY what cables, adapters, and docks are involved.
Please mention every device.
Macbook Pro M1 Max with Ventura 13.1 doesn't recognize Acer Predator XB273U GX monitor that supports DisplayPort Alt mode when connecting via USB-C to USB-C, why?
