Now that you've assembled the basic components of your PC, it's time for the initial power-up.

But... let's not start out too quickly. Review what you've done so far and verify everything is properly installed and attached.

• Check your fans, especially the CPU fan. Be sure it's attached to the power connector on the motherboard (or power supply, depending on your model).
• Check your motherboard power connectors. Make sure the power supply leads are inserted completely into the connectors.
• Check the 110/220VAC switch on the back of your power supply. Make sure it's set for the correct voltage. The proper setting is 110 in the US. If you're unsure about the voltage where you live, then find out before you continue.
• Check the cables connecting your components to the motherboard. Make sure they're properly attached and completely connected.
• Look over the cables and wires in the PC. Be sure your cables aren't severely blocking airflow or keeping fan blades from turning properly (see PC Cooling).
• Check your memory (RAM), and make sure all chips are fully seated.
• Connect your mouse, keyboard, monitor, and power supply cable.
• Power up your monitor
• Press the power switch on your computer.

At this point, if all is configured properly, you should notice you the power supply fan, cpu fan, and usually any case fans spin up right away. It's OK if the case fans spin down or turn off shortly after power up, this is normal since most are thermostatically controlled. However, the CPU and power supply fan should remain on. If either of these fans is not runnning after initial power-up, turn off the PC immediately and check your connectors. If the power supply fan is not running, but the PSU is providing power, then you may have a bad power supply fan.

If you notice any loud knocking or grinding noises (or any noise that just doesn't sound "right"), turn off your PC immediately and recheck your components.

A quick beep or two from the PC speaker is normal (some motherboards beep when booting, and others do not).

If you notice a single or several long, loud beeps, then the motherboard is telling you that something isn't properly configured. Check to make sure your memory is inserted properly and in the right order. You should refer to your mainboard's manual for information on how to install memory. Your motherboard's manual should also give you information about the beeps themselves. For instance, 2 beeps could indicate a memory error, 3 beeps could indicate a CPU error, etc.

The BIOS will usually display a key sequence required to enter Setup mode. Just follow the on-screen instructions to get there. In setup mode, you can verify that your hardware is functioning properly. You probably won't need to change any settings--most modern motherboards are sophisticated enough to take care of hardware connfigurations automatically. If you have special hardware or unique configuration requirements, check your motherboard's manual for more information.

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