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2 Removal and Replacement Procedures
Microtower (MT) Chassis
Adherence to the procedures and precautions described in this chapter is essential for proper service.
After completing all necessary removal and replacement procedures, run the Diagnostics utility to
verify that all components operate properly.
NOTE: Not all features listed in this guide are available on all computers.
Preparation for Disassembly
1. Close any open software applications.
2. Exit the operating system.
3. Remove any media from the computer.
4. Turn off the computer and any peripheral devices that are connected to it.
CAUTION: Turn off the computer before disconnecting any cables.
CAUTION: Regardless of the power-on state, voltage is always present on the system board
as long as the system is plugged into an active AC outlet. In some systems the cooling fan is on
even when the computer is in the “Standby,” or “Suspend” modes. The power cord should
always be disconnected before servicing a unit.
5. Disconnect the power cord from the electrical outlet and then from the computer.
6. Disconnect all peripheral device cables from the computer.
NOTE: During disassembly, label each cable as you remove it, noting its position and routing.
Keep all screws with the components removed.
CAUTION: The screws used in the computer are of different thread sizes and lengths; using
the wrong screw in an component may damage the component or the computer.
4 Chapter 2 Removal and Replacement Procedures Microtower (MT) Chassis