Problem in printing using HP DeskJet 960c printer

Hello,
About 3 weeks ago I changed the color cartridges of my HP DeskJet 960c printer. It was working well until yesterday when I was trying to print a black and white page. But the printed page includes some portion of blue in it. But the blue cartridge is also recently being changed. I tried to uninstall the program. But after completing the process when I restarted my PC, I saw that the computer again recognized the printer. How can I solve this problem?
