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I have tried both opening existing files and starting new ones. InDesign will go through the initializing to open but then nothing. Sometimes when I try to create a new project, it will give me the initial screen to set up a New Document, but again then nothing. It was working fine yesterday, no pending updates, all other programs (Illustrator, PhotoShop, etc.) are working fine.
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reset your preferences - https://forums.adobe.com/thread/526990
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Moving to InDesign​
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As kglad said, restoring your preferences is the first step. Here's another link:
Trash, Replace, Reset, or Restore the application Preferences