Make sure two of the metal slot tabs on the case are removed for the card, which I assume is a dual slot card. The metal case tab that matches the pci-ex slot on the motheboard, and the one right next to it. If you leave one of those metal slot covers on it will prevent the card from seating properly.
Also, the parts that must align are the part of the card that fits flush against the back of the case, and the other end of the card, the end that is usually latched on to the motherboard. If you look at how you are attempting to insert the card, if that latch end isn't positioned right then it doesn't matter what's happening with blue/purple/whatever. If that latch isn't aligned right then the card isn't aligned right. Once you get the position of the latch end right, then you can study what is the problem on the other end- the end fits up against the back of the case.