Black Video Display when connected to second monitor

Hello AlexisNexus,

To help us get a better understanding of the issue, so we can assist, we’d like to ask a few questions.

1. Does the issue only happen when playing video in those specific apps, or does it happen at other times as well?
2. Do you receive any errors before the issue occurs? If so, what does the error say?
3. When the issue happens, does the entire external display go blank, or only the app you're using to play the video?

The above information will help us determine how to proceed.

Please also check out this link, which has information and suggestions that may help with this external display issue: If your external display isn't detected or appears blurry when connected to your Mac

Before you begin

Make sure that your Mac is running the latest version of macOS.

If your display is blank or not detected

Try these steps if you don't see an image on your display.

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.

Thanks!