HP Photosmart B8550 gives message that printer is out of paper. It is not. Paper tray is properly seated. Preferences set to full sized plain paper. Hp Scan Doctor 4.3 run. Printer Hardware Information Extended self test diagnostic page 1 of 2 printed perfectly. Will not print anything else and the screen tells me to load glossy photo paper even though preferences calls for full sized plain paper in main tray. Photo input tray activates but printer will not feed from the main tray (lower tray).