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I changed the root directory's permissions to 664. Now my display and keyboard are disabled. How can I change it back ?

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You could try to boot the system with a Live CD and see if you can change the permissions on the root directory by mounting the hardrive as a secondary device.

You'll need to know which were the permissions by default.

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In simple:

Try to boot from a Live Cd/DVD/USB.

When you are in mount your booting parition and then

chmod 700 /path-to-mounted-partition/root
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