Here come two questions from you: why is my computer not casting?
How do I fix the issue?
After reading this post fromMiniTool, you clearly know the reasons and solutions to this problem.

These situations can happen if the data pipe drivers are outdated or the data pipe is not configured correctly.
Fortunately, it is an easy problem to fix as long as you follow these methods below.
Just try them one by one until you get rid of your issue.
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If you have a need, you’re able to also try this method.
This can fix some hardware and equipment errors including equipment casting issues in Windows.
Step 1: Go toStart > controls > Update & Security > Troubleshoot.

Alternatively, you’ve got the option to inputtroubleshootto the search box of Windows 10 and clickTroubleshoot prefs.
Step 3: This troubleshooter will detect errors and fix them.
Receive “an error occurred while troubleshooting” message when using Windows Troubleshooters to fix some issues?

Here are 8 helpful ways to fix it.
Alternatively, you’re able to typenetworkto the search bar and clickNetwork statusto the following interface.
Step 2: ClickNetwork and Sharing CenterandChange advanced sharing prefs.
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Step 3: see to it these items are checked Turn on connection discoveryandTurn on file and printer sharing.
Step 4: Save all the changes and then see if Cast to equipment can work well.
This can ensure the player to be configured for media streaming as required.

Microsoft removes Windows Media Center from Windows 10, but many users want it back.
This post will tell you how to do to get the custom version of WMC.
Step 1: TypeWindows Media Playerto the search box and tap the result.

Step 2: Go toStream > Allow Internet access to home mediaand confirm the selection.
Step 3: Go toStream > Turn on media streamingand confirm your selection.
Thus, you should check that it is up-to-date so as to fix your problem.
Step 1: PressWin + Xand clickDevice Manager.
Step 2: ExpandNetwork adapters, right-click your driver and chooseUpdate driver.
Bottom Line
Is Cast to equipment not working on your Windows 10 PC?
Take it easy and this feature should work properly after you try these methods mentioned above.