Identify the exact player and renderer
Record the maintained MPC-HC build and the renderer currently selected under the documented output controls. A component installed elsewhere on the computer may not be the component this copy uses. Keep portable and installed copies distinct if both exist.
For a hypothetical setup, somebody may follow installation instructions but continue launching an old shortcut. The original player can then retain its previous output selection. Verify the running copy before describing the newer renderer as ineffective.
Compare the same supported sample
Consult the README and current renderer guidance for the supported configuration. Preserve the original selection, then use one permitted HDR sample whose characteristics are known. Keep television or monitor mode and the physical display route constant during the first comparison. Record which screen carries the player when several displays are connected.
Record whether the issue is incorrect colour, no picture, a format switch or a playback failure. A file named HDR does not establish its actual format, and a bright picture does not independently verify every intended output property. Use available media information rather than judging only by the filename.
Keep the complete display path
A renderer choice is one part of the route. The source, operating-system display setup, graphics hardware and connected display can still matter. Do not assume that selecting a renderer makes an unsuitable monitor support a format it cannot display.
When seeking help, provide the player build, active renderer, source information, Windows display state and physical connection. Hide private file paths. This article focuses on an installation-versus-selection distinction from the project documentation; it does not test a renderer binary, certify HDR accuracy or promise the same result on every display.