I have a HP 4600 that is printing only blank pages, test pages, all apps and even config pages. This is a network printer using the HP UPD ver 4.7. It was working yesterday morning without issue then after adding another queue (a queue set to non duplex) to the same physical printer it stopped working. I have removed the new (non duplex) print queue, no change. I have rebuilt the original print queue, no change. I have done all the basics, check toner, restart printer, set printer to defaults. Nothing has helped. Any suggestions?