xii IBM Personal Computer User GuideSafety while working with hardwareEach time you open your computer, you must follow specific safety procedures toensure that you do not damage your computer. For your safety, and the safety ofyour equipment, follow the steps for "Disconnecting your computer" on page xiiibefore you remove the cover of the system unit (if included with the model youpurchased).Connecting your computerTo connect your computer:1. Turn off the computer and any external devices (such as a monitor or printer)that have their own power switches.2. Attach a signal cable to each external device (such as a monitor or printer), andthen connect the other end of the signal cable to the computer.3. Attach communication cables (such as modem cables or network cables) to thecomputer. Then, attach the other ends of the cables to properly wired commu-nication outlets.4. Attach the power cords to the computer and any external devices (such as amonitor or printer), and then connect the other ends of the power cords to prop-erly grounded electrical outlets.5. Turn on the computer and any attached devices that have their own powerswitches.To avoid shock hazard:Danger!• Do not connect or disconnect any cables orperform installation, maintenance, orreconfiguration of this product during anelectrical storm.• The power cord must be connected to aproperly wired and grounded receptacle.• Any equipment to which this product will beattached must also be connected to properlywired electrical outlets.• Electrical current from power, telephone, andcommunications cables is hazardous. Toavoid shock hazard, use the steps describedin this section to connect and disconnectcables when installing, moving, or openingthe cover of this product.• Never install telephone wiring during alightning storm
