I have been trying to solve this problem for a week now. I need your help. I am running XP and have a hp laserjet 4200. It worked fine on my other computer with a serial port, but now that I only have a USB hookup, my print jobs will not come out until I restart my computer. I get a generic printer error sometimes, and other time I get no message at all. I am using hp laserjet 4200 pcl 6 driver. Any help would be appreciated!