I've had this printer for a while and it has always worked magnificently. But my roommate had to print some stuff, her computer was broken so I let her use mine and print from it, and the ink catridge was out so she replaced it and it printed a test page and won't print anything else. In the printer queue it just says "error-printing". I downloaded HPs diagnostic tool and it says it's not connected right--but it is I have disconnected and reconnected again and again. It also tells me that the devnodes for the device are missing, yellow - something or disabled. I have no idea what a devnode is. I tried to uninstall the driver and reinstall and now the computer senses the printer but the diagnostic device does not. I have rebooted and unplugged and done all the basic reset things. What's going on? My OS is Vista. Please tell me its the printer.