Scanning Device not Communicating with the Computer

Can anyone help? I go to launch my Hp Director software to scan a document and an error message appears that says "An error occurred communicating with the scanning device. Please ensure that the scanning device is connected properly and try again." This has happened before but I can't remember the steps performed on the Menu of the scanner. Does anyone know how to get the computer and Laserjet 2840 to communicate?
Thanks

AlmostThere wrote:
If the error message appears on the computer while scanning from a networked product, click this link: http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=au&product=3204785&docname=c00897542. If with USB, click this link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00040499&cc=au&lc=en&dlc=en&product=3204785
Regards,
AlmostThere
your link @ http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=au&product=3204785&docname=c00897542 doesn't work

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Scanning Device not Communicating with the Computer

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