I just upgraded to 25 PRO and I can’t open my existing files. I can’t open them in 24 either. What’s happened?
Hard to say without more information. Share a .skp file that won’t open for you.
Where have you been saving the files? Did they open in SketchUp 2024 before?
BTW, the graphics card does matter.
Do the files show an error message, or does SketchUp crash? If it crashes, does a bugsplat window appear, and have you sent any of those to us?