Dell OptiPlex N Service Manual

Also see for OptiPlex N: Troubleshooting guide User guide

Contents

Basic Troubleshooting 2-7Internal Visual InspectionA simple visual inspection of a computer’s interior hardware can often lead tothe source of a problem, such as a loose expansion card, cable connector, ormounting screw. When you perform the visual inspection, refer to “System Fea-tures” in Chapter 1 to locate components in the inspection procedure.To perform the internal visual inspection, follow these steps:1. Turn off the computer, including any attached peripherals, and dis-connect all the AC power cables from their power sources.Wear a wrist grounding strap, and clip it to an unpainted metal surface, suchas the padlock loop on the back of the chassis. If a wrist grounding strap isnot available, touch an unpainted metal surface on the back of the computerto discharge any static charge from your body.2. Remove the computer cover as described in “Computer Cover” inChapter 4.3. Verify that the chips, DIMMs, expansion card, and riser board are fullyseated in their sockets or connectors.To ensure that the chips are fully seated in their sockets, press firmly on thetop of each chip.To reseat the microprocessor, remove it from its socket and reinstall it asdescribed in “Microprocessor/Heat Sink Assembly” in Chapter 4.To reseat a DIMM, remove it from its socket and reinstall it as described in“DIMMs” in Chapter 4.If you need to reseat an expansion card, remove it from its connector andreinstall it as described in “Expansion Card” in Chapter 4.If you need to reseat the riser board, remove it from the expansion-card cageand reinstall it as described in “Riser Board” in Chapter 4.4. Verify that all jumpers are set correctly.For information about these jumpers, see “System Board Jumpers” inChapter 1.CAUTION: Before you proceed with the internal visual inspectiondescribed in this section, ensure that the user has saved all open files andexited all open application programs if possible.WARNING: The microprocessor can get extremely hot. Be sure themicroprocessor/heat sink assembly has had sufficient time to coolbefore you touch it.While reseating the microprocessor/heat sink assembly, use a wristgrounding strap or maintain contact with a metal surface on thechassis.