Dell OptiPlex Gn+, Service Manual

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Basic Troubleshooting 2-3
8. Inspect the exterior of the computer, including all controls and indica-
tors, and all user-accessible data storage devices for any signs of
physical damage.
Does the inspection reveal any problems?
Yes. Refer to the procedure in Chapter 4, “Removing and Replacing Parts on
the Low-Profile Chassis,” Chapter 5, “Removing and Replacing Parts on the
Midsize Chassis,” or Chapter 6, “Removing and Replacing Parts on the
Mini Tower Chassis,” as appropriate for your computer.
No. Proceed to the next section, “Observing the Boot Routine.”
O
bserving the Boot Routine
After you perform an external visual inspection as described in the previous
section, you should boot the computer and, while the boot routine is running,
observe the computer for any indications of problems.
NOTES: To prevent possible damage to the original diagnostics diskette, always
use a backup copy of the diagnostics diskette when servicing a user’s computer.
Dell recommends that users make copies of the Dell Diagnostics Diskette. For
instructions, see “Before You Start Testing” in Chapter 4 of the Diagnostics and
Troubleshooting Guide.
Most of the steps in this procedure require observation of computer functions
and indications, some of which can occur simultaneously. It may be necessary
to reboot the computer several times in order to complete all of these steps.
To observe problem indications during the boot routine, follow these steps:
1. Insert the Dell Diagnostics Diskette into drive A. Turn on all peripherals
and the computer. If the computer is already on, press the reset button
or <Ctrl
><
Alt
><
Del> to reboot the computer.
2. Check the power supply fan.
Does the fan run normally?
Yes. Proceed to step 3.
No. Troubleshoot the computer power supply.
3. Watch the Num Lock, Caps Lock, and Scroll Lock indicators on the
upper-right corner of the keyboard. After all three indicators flash
momentarily, the Num Lock indicator should light up and remain on.
Do these indicators flash on and off within approximately 10 seconds after
the boot routine starts?
Yes. Proceed to step 4.
No. Troubleshoot the computer power supply. If the troubleshooting pro-
cedure indicates that the computer power supply is operational, troubleshoot
the memory subsystem.