I downloaded Intellij Idea and was using it just fine for a while. I don't know what happened between the time it was working and when it started to not work. When I would click the shortcut, my mouse would give me the loading wheel and then nothing would happen. In task manager, there is a task called "IntelliJ Idea" running. I uninstalled and reinstalled twice, and then installed it with the JetBrains toolbox, but this is still happening. I saw another thread about this from 4 years ago, but none of the solutions worked for me.
Other thread: Intellij IDEA won't start