90 Adding and Replacing Parts2 Ensure that the computer and any attached devices are turned off. If yourcomputer and attached devices did not automatically turn off when youshut down your operating system, press and hold the power button forseveral seconds until the computer turns off.Before Working Inside Your ComputerUse the following safety guidelines to help protect your computer frompotential damage and to help ensure your own personal safety.CAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in theProduct Information Guide.CAUTION: Handle components and cards with care. Do not touch the componentsor contacts on a card. Hold a card by its edges or by its metal mounting bracket.Hold a component such as a processor by its edges, not by its pins.NOTICE: Only a certified service technician should perform repairs on yourcomputer. Damage due to servicing that is not authorized by Dell is not covered byyour warranty.NOTICE: When you disconnect a cable, pull on its connector or on its strain-reliefloop, not on the cable itself. Some cables have a connector with locking tabs; if youare disconnecting this type of cable, press in on the locking tabs before youdisconnect the cable. As you pull connectors apart, keep them evenly aligned toavoid bending any connector pins. Also, before you connect a cable, ensure thatboth connectors are correctly oriented and aligned.NOTICE: To help prevent damage to the computer, perform the following stepsbefore you begin working inside the computer.1 Ensure that the work surface is flat and clean to prevent the computercover from being scratched.2 Turn off your computer. See "Turning Off Your Computer" on page 89.NOTICE: To disconnect a network cable, first unplug the cable from your computerand then unplug it from the network wall jack.3 Disconnect any telephone or network cables from the computer.NOTICE: To help prevent damage to the system board, you must remove the batteryfrom the battery bay before you service the computer.NOTE: To avoid damage to the computer, use only the battery designed for thisparticular Dell computer. Do not use other batteries designed for other Dellcomputers.
