104 Removing and Installing PartsTurning Off Your ComputerNOTICE: To avoid losing data, save and close all open files and exit all openprograms before you turn off your computer.1 Save and close any open files and exit any open programs.2 Click Start , click the arrow , and then click Shut Down.The computer turns off after the operating system shutdown process finishes.3 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 foratleast 8-10 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 to ensure your own personal safety.CAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in the Product Information Guide.NOTICE: 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 your computer.Damage due to servicing that is not authorized by Dell is not covered by your warranty.NOTICE: When you disconnect a cable, pull on its connector or on its pull-tab,not on the cable itself. Some cables have connectors with locking tabs; if you aredisconnecting this type of cable, press in on the locking tabs before you disconnectthe cable. As you pull connectors apart, keep them evenly aligned to avoid bendingany connector pins. Also, before you connect a cable, ensure that both connectorsare correctly oriented and aligned.NOTICE: To disconnect a network cable, first unplug the cable from your computerand then unplug the cable from the network device.1 Disconnect all telephone or network cables from the computer.NOTICE: To avoid damaging the system board, you must remove the main batterybefore you service the computer.2 Disconnect your computer and all attached devices from their electrical outlets.
