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Chapter 2 covered motherboard replacement extensively, and here we discuss issues related to building a computer from scratch or disassembling a computer: I/O shield, standoffs, and retaining clips. Some cases include a standard I/O panel shield that may need to be removed to install the I/O shield that comes with some motherboards. The I/O shield is a part what allows for optimum air flow and grounding for the motherboard ports. The I/O shield helps ensure the motherboard is installed correctly and properly aligned with the case. Figure 4.11 shows a motherboard I/O shield.

Figure 4.11

Figure 4.11. Motherboard I/O shield

Some computer cases have plastic or metal (commonly brass) standoffs that allow the motherboard to be screwed into the case without the motherboard solder joints touching and grounding to the computer case, causing the motherboard not to work. Some standoffs are plastic, and they slide into slots on the computer case. Do not remove these types of standoffs but just leave them attached and slide the motherboard out of the slots. The most common type of standoff is a metal standoff that screws into the case; this standoff has a threaded side that the motherboard sits on and a screw that attaches the motherboard to the standoff, as shown in Figure 4.12.

Figure 4.12

Figure 4.12. Motherboard standoff

Some motherboards not only have screws that attach them to the metal standoffs but one or more retaining clips. A retaining clip might need to be pressed down, lifted up, or bent upward in order to slide the motherboard out of the case. The case might contain one or more notches and require the motherboard to be slid in a particular direction (usually in the direction going away from the back I/O ports) before being lifted from the case.

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