I have had a Canon MP620 for quite a while and have been very pleased with it. However, about a week ago, it suddenly stopped working correctly. I finally reinstalled the new drivers for windows 7 (Which I am using) and got it back to where the printer functions correctly except for the fact that the printed material looks faded on all colors and black. I have installed new ink cartridges for all colors and the two black tanks but I still have "washed out" appearing outputed printed material on everything it prints. What else can I do?