Cannot print in Black on a 4500 all in one

I have a HP 4500 all in one Office jet.  I have cleaned the print heads a dozen times. The unit will not print an alignment sheet, or print in black. 

At best I get a very light blue-gray printing, and none from an attempt to print from Notepad.  My operating system is W7.  Even when I set the printer for 'greyscale' and 'print text in black' I get a light blue-gray print when it prints at all.