Now you need to connect all devices to the power supply. In our case our computer had a CD burner, a hard disk drive and a floppy disk drive, so we had to connect these devices to  the power supply, plus the motherboard. Depending on your configuration you will need to install more cables.

Notice that all power connectors have a correct way to be inserted, i.e., they have a ”right“ and a ”wrong“ side. If you can’t insert a power plug, just flip it and try it again, as it may be at the wrong position.

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Figure 20: Installing a power connector on our CD burner.

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Figure 21: Installing a power connector on our floppy disk drive.

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Figure 22: Installing a power connector on our hard disk drive.

Now it is time to connect your power supply to your motherboard. As you know by now, two connectors are used: a main connector with 20 or 24 pins and an auxiliary 4-pin connector, called ATX12V. Some low-end motherboards don’t have this ATX12V connector.

Let’s first install the smaller connector (ATX12V), as shown in Figure 23.

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Figure 23: Installing the ATX12V auxiliary connector on the motherboard.