Startup / black-screen / early initialization failure

LMU can fail before reaching a session when its saved display or browser initialization settings are unusable. First identify which initialization step fails.

Automatic repair availableActiveEvidence reviewed 2026-09-01Guide updated 2026-09-29

Checks and expected results

Before you repair it

Note whether a window appears, stays black, or closes before the menu.
Check the current trace for Config_DX11, dx11 configuration, or CEF initialization failures.
Close LMU and keep the existing configuration backup and display settings before a targeted reset.

How to confirm the result

Relaunch to the menu, confirm resolution and display selection, then load a session. If a CEF setting was tested and did not help, restore its previous value.

Repair limits and when to stop

A black screen alone does not establish configuration corruption. Do not reset the entire profile for a clearly identified driver or game-content failure; change only the implicated settings.

How PitMedic recognizes it

LMU exits during early configuration or CEF/video initialization before a session begins.

Signals PitMedic may recognize

CEF
Config_DX11
dx11_config
black screen

Built-in response

Back up and regenerate Config_DX11/dx11 configuration; if evidence points to CEF, test supported CEF mode values with rollback.

Repair safetyReversible / one-click

Verification sources

PitMedic prioritizes vendor documentation and labels community findings separately.

Common FixesLe Mans Ultimate Support · Official source
Official guidance recommends deleting the DX11 config on launch crashes.
Open source
Instant crash after startLe Mans Ultimate Community · Official source
Moderator guidance includes DX11 config, CEF mode and sound config recovery.
Open source