Salut Jeanb,
Depuis: https://windowsreport.com/bitlocker-password-prompt-screen-windows-10/
Windows 10 BitLocker black screen – This is a relatively common problem, and in order to fix it, you just need to enter your password, even if the prompt screen isn’t visible.
BitLocker asking for recovery key instead of password – To fix this issue, you can try using the Command Prompt to enter your recovery key and then encrypt your hard drive again.
BitLocker blue screen – This is a common problem, and it might be caused by outdated BIOS. Update your BIOS and check if that solves the issue.
BitLocker does not prompt for password – If you encounter this issue, try switching to the LegacyBoot and check if that solves your problem.
BitLocker password prompt is not working – This problem can occur due to the Fast Startup feature, but once you disable it, you should be able to use the password prompt again.
Peut importe la version de Windows, je pense que ca doit être similaire…
Bonne journée