If those commands didn't work there may be another problem:

- make sure that you still have an internet connection if you are using SSH to connect to a remote machine
- Is the machine still running?
- Make sure your keyboard is still working on other programs than the console
- Double check if you pressed the Escape key before typing one of the commands

If all of these don't help, consider rebooting your machine and/or the remote machine (if you tried using vim on a remote computer)
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