I just picked up an AM3 x440 and a MSi 770 mobo for my new build... Although I'm having difficulties with the cpu, I lined up the marked corner with the proper direction and only the front of the cpu seems to fit, the back doesn't slid in at all. (latch on mobo is raised) I haven't tried forcing it or closing the latch while only half the cpu is in the socket, is there something wrong?
More abouttrouble installing
check to see if any pins are bent if so RMA it man.