Observing The Boot Routine - Dell Dimension V400 Service Manual

9. Inspect the exterior of the computer, including all controls, indicators, and
user-accessible data storage devices for any signs of physical damage.
Does the inspection reveal any problems?
Yes . Refer to the appropriate procedure in Chapter 4, "Removing and
Replacing Parts."
No . Proceed to the next section, "Observing the Boot Routine."
After you perform an external visual inspection as described in the previous
procedure, you should boot the system and, while the boot routine is running,
observe the system 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 7 of the
Reference 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 a copy of the diagnostics diskette into drive A. Turn on all peripherals
and the computer. If the computer is already on, press <Ctrl><Alt><Del>
or the reset button to reboot the system.
2. Check the power supply fan.
Does the fan run normally?
Yes. Proceed to step 3.
No. Troubleshoot the system 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 proce-
dure indicates that the computer power supply is operational, troubleshoot
the memory subsystem.
Basic Troubleshooting 2-3