I need to change the display configuration of my macbook but I can't see to open the preferences (because the configuration is wrong!) - what can I do?

I need to change the display configuration of my macbook but I can't see to open the preferences (because the configuration is wrong!) - what can I do?

(cannot update previous post, exceeded timinout)
4. In case any of the previous operations work but the settings don't "stick".  There are two plists associated with the settings:
/Library/Preferences/com.apple.windowserver.plist
~/Library/Preferences/ByHost/com.apple.windowserver.XXXXX-XXXXXXX.plist
The first is global to all accounts while the second is in your home directory.  The X's are a sequence of hyphaninated  letters and numbers.  If you can get these removed then it will probably revert to a default resolution.

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