System is HP desktop running W7-64 bit. Printer is HP Photosmart 7350, old but working perfectly until 2 days ago. Driver is Deskjet 5550 (closest one for this printer). I've reinstalled the driver, plugged and unplugged the printer, and tried to print from different programs. As soon as the print button is selected the error condition shows in the Devices & Printers section. This happens whether the printer is turned on or not. What can I do to get the printer running again? TIA.