Borrowing from ConcernedApes
previous comments can you try out these things -
- Delete the startup_preferences file in %AppData%/StardewValley
- Go into the game file directly (you can find this by right clicking game in steam library > properties > local files > browse local files...) and then into the folder titled “_CommonRedist”, then “XNA”, then “4.0”, then “xnafx40_redist” installer. Once there, run the installer and hit repair.
- If you don’t have SMAPI installed, right-click on Stardew Valley in Steam, then go to Properties > Set Launch Options, and make sure it is empty.
- If you are running the software "RivaTuner", exit out of it completely before running the game
- Go to Device Manager > System Devices and check if there is something called "FrescoLogic Display Adapter". this can cause incompatiblity issues.