I'm using an older computer that apparently doesn't support Shader Model 1.1+. It tells me to switch to Open Gl Mode but for some reason after I click it nothing happens at all. What can i do?
Try holding shift when osu! is first starting up and select opengl from there instead.
Otherwise make sure everything on your computer is up to date, or post your specs. It's possible your graphics card may not be able to run osu! if it's outdated enough.