After launch game, screen keep black but sound is ok.

I use ALT + ENTER to make it be window mod,  and then display could be correct in the moment of after move the window, I mean release mouse

If you're encountering an issue where your game opens on a black screen, try forcing the game to match your monitor's refresh rate. Right click the game in your Steam library, then select Properties. In Launch Options, type -refresh XX and close the window. (Be sure to replace XX with your monitor's specific refresh rate: 60, 120, etc.) If this does not solve your issue, please contact SEGA support. https://support.sega.com/

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