Adding and Replacing Parts 141NOTICE: To disconnect a network cable, first unplug the cable from your computerand then unplug the cable from the network device.3 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.4 Disconnect your computer and all attached devices from their electricaloutlets.Removing the Computer Cover and Front PanelRemoving the Computer CoverCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in theProduct Information Guide.CAUTION: To guard against electrical shock, always unplug your computer fromthe electrical outlet before removing the cover.NOTICE: To prevent static damage to components inside your computer, dischargestatic electricity from your body before you touch any of your computer’s electroniccomponents. You can do so by touching an unpainted metal surface on thecomputer.1 Follow the procedures in "Before You Begin" on page 139.NOTICE: Opening the computer cover while the computer is running could result ina shutdown without warning and a loss of data in open programs. The computercooling system cannot function properly while the cover is removed.2 If you have installed a security cable, remove it from the security cable slot.NOTICE: Ensure that sufficient space exists to support the removed cover—atleast 30 cm (1 ft) of desk top space.NOTICE: Ensure that you are working on a level, protected surface to avoidscratching either the computer or the surface on which it is resting.3 Lay your computer on a flat surface with the cover facing up.4 Pull back the cover latch release.
