Thanks a lot for your response.
A service person told me that immersing the printer head into a certain solution (He could not tell which) for a entire day sometimes solve problems arising out of clogging. I think I should try that.
My MG 5370 is less than two years old. It is still under warranty. A few months back I noticed that Black is not getting printed when I am printing a document or image. But when I was using copy function the black was being replaced by blue and everything was perfect. All my cartridges were...