I have been aware of this issue for quite some time. More than likely, the problem is not hardware related. First, verify that the printer firmware has been updated to the current level. At the time of this writing it would be v. 4.13. Secondly, verify that the driver is updated - or, try a different driver...pcl vs. ps. Third, if the client is printing a pdf document, verify that "language level 2" is selected in the driver. Some pdf docs will cause this error if the lang level is set to 3. In my experience, it appears that the problem is caused by an object in a document that the printer cannot interpret thus throwing up the notorious err49. I have called HP regarding this issue but the response I get is that 'we are working on the issue...'