I have a Canon Selphy photo printer which is no longer printing from my PC (XP Media Center 2005) - I have tried reloading the driver, a new cable and all withour=t success! The picture spools and the driver shows it to be ready - I get the usual ping response when I connect the printer to the PC - but nothing comes out. The printer is working OJK as it prints from my digi camera using Pictbridge. Any suggestions as to what the problem might be?