Moment of Truth
This page is going to show you what happens after the physical build is finished and you are ready to turn the computer on for the very first time. This moment is often called the POST, which stands for Power On Self Test. When you press the power button, the motherboard quickly checks all of your parts to make sure the CPU, memory, and graphics card are all working correctly. If everything is installed right, you will often hear a single short beep from the internal speaker, which is a great sign that your build was a success. If the computer does not start or if you hear a series of long beeps, it usually means a part is not seated correctly in its slot. Troubleshooting these small issues is a normal part of the process, so you should stay calm and double-check all of your power connections before trying again.
Once you know the hardware is working, the final step is to install an operating system like Windows or Linux so you can actually use the computer. You will need to plug in a USB drive that has the installation files and tell the computer to start from that drive in the BIOS settings. The installation process usually takes about twenty minutes and will ask you to create a user account and connect to your home internet. After the software is finished installing, you should check for any driver updates to make sure your graphics card and other parts are running at their best performance. It is a very rewarding feeling to see your desktop screen appear for the first time on a machine that you built with your own hands. Now that the software is set up, your custom PC is officially ready for gaming, schoolwork, or any other projects you have planned.