Epson SX415 Printer, is recognising cartridges, but as soon as they are installed they are showing as a low ink levels. Changed them again, but random colours appear low again!! Grrrhhh. Have used the alignment tool, print head cleaning etc... Now it won't read the Yellow, but I have only just put it in. I am sooooo frustrated as need to print for deadline exam, could you give any suggestions? Thanks.