NetworkManager makes Fedora 19 freeze

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If you have to manually start NetworkManager, use this command: systemctl start NetworkManager

To enable it to start on subsequent boots, use the command systemctl enable NetworkManager - although I would wait until we find the cause of the freeze before doing so.

The first thing to do when troubleshooring is to update the system. Make sure that your packages are up to date.

To view logs from the previous boot, and see what was recorded before the lock, use the command journalctl -b -1. Update your question with anything relevant you find there.