On starting, why does Unity HDRP display a black screen?

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There are several potential reasons why Unity HDRP may display a black screen on starting, including:

1. Camera settings: The camera settings may not be configured correctly, resulting in a black screen. Ensure that the Clear Flags setting is set to "Solid Color" and the Background Color is not black.

2. Missing light sources: If there are no light sources in the scene, the screen may appear black. Add light sources to the scene to resolve this issue.

3. Pipeline issues: If there are any issues with the High Definition Render Pipeline (HDRP) configuration, it may result in a black screen. Check the HDRP settings, and ensure that the HDRP Asset and Post-Processing Volume components are added to the scene.

4. Shader errors: Errors in shader programs may cause the screen to appear black. Check the console window for any error messages related to shaders.

5. Asset issues: If there are any missing or corrupted assets in the scene, it may cause the screen to appear black. Check the project files for any missing or corrupted assets and replace them as necessary.

6. Graphics driver issues: Graphics driver issues may also cause the screen to appear black. Update the graphics drivers to resolve this issue.

Overall, troubleshooting the black screen issue in Unity HDRP requires a thorough analysis of the scene and configuration settings to identify the root cause of the problem.