1. Make sure your computer is fully powered off. Do this by clicking the Windows icon in the lower left, and then selecting “Shut down.”
2. Remove the cables attached to your computer. Once your computer is off, you need to remove all the cables from the back of your CPU tower.
3. Remove the side panel from the CPU tower. You can tell which panel you can remove by looking at the rear of the tower, unscrewing the screws along the edges, and sliding the panel off.
4. Attach the SSD. Grab your SSD and screw it onto a vacant drive bay inside your CPU case.
5. Connect a power cable to the SSD. Take a power cable from your power supply, which should have a flat connector, and connect it to the matching terminals in your SSD.
6. Attach a SATA connector. Take a SATA connector, which typically has a flat red cable and black ends, and plug it into the smaller terminals on your SSD.
7. Return the side panel to the CPU tower. Just slide the panel back on and firmly screw it in place at the back of the CPU tower.
8. Reattach all the cables to the CPU tower. Refer to the picture you took, if indeed you took one, to hook up all the cables you removed from the back of the CPU tower.
That's it. You completed installing a SSD inside a PC tower.