My printer has suddenly died! (HP Officejet J4540). When I try to print I receive a message that my printer is either off-line or disconnected. I achecked the USB cable several times and it seems to have a solid connection. I have turned the unit on and off several times hoping it could possibly reset itself. But that was unsuccessful. I have uninstalled and re-installed the software. Am I missing a setting somewhere? Something that is disabled, that should be enabled, that somehow the settimg was changed. Thanks for the advice!