First make sure all pins are straight. I use a credit card and a small precision screwdriver if the pin is too far over I straighten with it then run a credit card down the rows. MAKE SURE IT IS THE RIGHT THICKNESS. IE: I use a Auto Zone card. Perfect fit. I use a flashlight on an angle to find the bent pins. Once all are up I run the card through all rows up and sideways. Then carefully seat your CPU from the corner that is marked differently than the other three. If the pin is broken I have seen people straighten the pin count the holes insert broke pin into MB and ease CPU on and it work. But I don't know if I have the dexterity to accomplish that. But pins can be fixed if you are comfortable with soldering. Good luck.