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Jumpers & Power Connections / Connectors Now that we've covered the main components of the motherboard and how they function/interrelate, there is one more factor to include and that's the jumper and power connection. Jumpers are small pins located on and around the motherboard that facilitate a setting change of some device or device function, with them comes jumper blocks – these are little black block with metal inside that covers a jumper. These settings and change capabilities and devices they are associated with will vary from one motherboard to another, so it's vital to investigate the markings on the motherboard and become intimately familiar with them so that they correct settings and configuration can be made in relation to what those jumpers control. You'll observe jumper controls for fan, near the CMOS for BIOS password resets, and how a jumper block can connect two jumper pins. Pay close attention to the diagram and explanation, you'll use these skills endlessly! FYI Jumper blocks can also be used on hard drives to help the motherboard determine if the drive is the MASTER (main bootable) drive or a SLAVE (add-on) drive used in addition to the master. Just as with a motherboard, the drive settings vary from hard disk drive to hard disk drive, within the same OEM family of drives. So research the settings guide on the drive to determine the correct jumper block placement for the drives intended use.