I use this printer for printing inkjet printable CDs and DVDs. It is relatively new (less than 6 months). I just replaced three of the 6 ink cartridges. Now I am getting dotted lines down the pages/CDs for two of the colors I replaced (black and magenta). Does anyone know what could be causing this? I used Epson cartridges. I've been through the Nozzle Test and Head Cleaning but neither helped. Any suggestions?