Once you have your PSU installed, it is time to install your motherboard.
Remove your motherboard from the box along with the manual. The manual will usually provide a pictured diagram with all the ports and slots available on your motherboard, along with a general installation guide. Unlike older motherboards, no real setup is required. Most motherboard settings can now be adjusted in the BIOS, after your computer is assembled. All you need to do is line up the motherboard in the correct position, matching up with any standoffs installed into your case. Next, screw in the matching screws provided with your motherboard or case.
Once you have your motherboard securely screwed into place, you can now attach the power cable. Your motherboard will have a rectangular slot for the power supply to connect. It should be the largest cable coming from your power supply. Simply plug the cable in, keeping in mind it should only fit one way. Next you can connect any additional cables that are connected to your computer case, the cables mentioned earlier for usb or headphone jacks on the case’s front panel. You can also wait to do this later if these cables get in the way of installing any other components.
Now that your motherboard is installed, it is time to install your CPU and Heatsink/Fan.