My HP plotter have suddenly stopped working with autocad. It works from word, so i know it's connected/installed, but in autocad i get this two messages:"Test failed" and "The plotter configuration cannot be used for one of these reasons: the drver cannot be found, the device cannot be found, or the river has a problem." any ideas? 

Uninstall then reinstall the printer and its drivers as per the manufacturer's recommended instructions.