Printer was printing fine until I changed all the ink cartridges. Colors print fine but the black does not print correctly. It will print grey but not black. I have cleaned the printheads, checked to make sure the vent is clean. When you print the print quality diagnostic the black box is empty, the test page the alphabet at the top is a very light grey and the black ink box on the right has light grey on the right, medium grey in the middle but then goes back to lighter grey on the left where it should be black. I have had this printer for 17 months and have changed the cartridges before with no problems. What gives this time?
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