Now that the motherboard is in place you can install the power supply. Some of you can skip this step because your case came with a power supply in it. But for some of you the power supply that came with your case isn't going to be strong enough to run your system so you will have to swap it. Which is the case in my situation.
Now on the back panel of your case you will see where your powersupply is located. remove the 4 screws holding it in place. I found it best to remove the bottom screws first,
and top left screw last and support the power supply while removing the last screw to ensure it does not fall and damage your newly installed motherboard.You have just installed or replaced your power supply.