[Sorry guys I have been having Internet Issues]
Yea, I would compare the check sum with the one on the chip and it'd just change everytime I read it, however it is more likely the reader playing up not the new chip. The reader has preset functions so that it reads in differant styles depending on the brand and type of chip, perhaps I had the wrong setting? (I don't think so) There is nothin I can do about it, for now