The yellow cartridge is not printing correctly if at all. Ran nozzle test, see attachment. Contacted Canon who stated it would appear to be a hardware problem and suggested I send the printer to their service centre in Surrey (I live in Staffordshire). Given the possible cost of postage and repair, the fact the printer is 10 years old and the relative low cost of current stand alone printers, economically this does not make sense. Before I go down the replacement option path (any suggestions for a similar printer to the iP4500?) any advice that will allow me to correct the fault myself would be appreciated.