3.Flip the CPU over and inspect the pins making sure none are bent. Also look for the 'notch' or marker indicating the correct orientation of the CPU on the motherboard.
4. Align the CPU with the motherboard slot (double check!) and then gently place the CPU into place. The CPU should just 'drop' in without any resistance. Do not force it. Lock the CPU into place using the lever or clamp on the motherboard. It may feel like the clamp will break the CPU - but if you've aligned the CPU correctly it will not. The clamp will be tight.
5. Find your heatsink/fan for the CPU. Also locate a fan-port on the motherboard with screen-printed label on the motherboard called "CPU". If you cannot find it, refer to your motherboards manual for where you should plug the CPU fan into.
6. Align the CPU fan and heatsink in such a way that it will be able to plug into the motherboard fan port, but also so that the fan cable will be out of the way of the fan blades and heatsink.
7. Most heatsinks come with thermal paste (usually a gray or white semi-liquid material on the bottom of the heatsink) - make sure yours does. Most heatsinks or fans also have spring-loaded push-locks that hold it against the CPU and onto the motherboard. Align these push-locks with the holes in the motherboard - then gently, but firmly, push the heatsink onto the CPU to create a seal with the thermal paste. Then push the push-locks through the holes until they 'click' through and have a firm hold on the motherboard. If your heatsink is different than described here - consult the CPU manual for installation instructions.
8. Plug in the CPU fan to the motherboard.