Hi Guys; I am new to this whole page posting thing. I have had my printer for 3 years, and now I ran into a problem. I changed my cartridges, 8 of them. I also tried to perform a tube flush, so I am now at Choose colour, 4 CMYK, Take cartridges out, after the flush I have to put in the cleaning solution, but my nr 7 black cartridge does not want to pick up the cleaning solution. can someone please help me, if its maybe the sensor????