First, What is DirectX Diagnostic tool?
Dxdiag (DirectX diagnostic tool) is a diagnostic tool used to test DirectX functionality and troubleshoot video or audio related hardware problems.
1) Open it through searching.
Type dxdiag in the search box on desktop and click dxdiag on the top of the list.
2) Using Command prompt.
Run Command prompt.
Input dxdiag.exe, and press Enter on the keyboard.
3) Open it via Run.
Display the Run dialog using Windows+R, type dxdiag and tap OK.
4) Enable it using Windows PowerShell.
Open Windows PowerShell through Start Menu or by search.
Input dxdiag and hit Enter.
