Before you begin

  1. Put on your electrostatic discharge (ESD) wrist strap to avoid damaging any circuitry.
  2. Remove all devices (such as diskettes and CD-ROMs) from the computer.
  3. Power off the computer and any peripheral devices that are connected to it.
  4. Disconnect the power cord from the electrical outlet and then from the computer. When the computer is plugged into an AC power source, there is always voltage applied to the system board. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage.
  5. Disconnect all peripheral device cables from the computer.

Static electricity


Static electricity can damage electrical components. Before removing or replacing a component, touch a grounded metal object to discharge static electricity. Also observe the following precautions to prevent damage to electric components and accessories: