Service Manual

If a system error message appears, see "System Messages."
Diskette-drive and hard-disk drive access indicators — These indicators light up in response to
data being transferred to or from the drives. If either of these indicators fails to light up during the
boot routine, troubleshoot the diskette drive or hard-disk drive subsystem, as appropriate.
5. Observe the monitor screen for the Diagnostics menu.
Does the Diagnostics menu appear?
Yes. See "Running the Dell
Diagnostics."
No. Proceed to step 5.
6. Insert another copy of the diagnostics CD or diskette into the appropriate drive, and reboot the system.
Does the Diagnostics menu appear?
Yes. See "Running the Dell
Diagnostics."
No. Proceed to "Internal Visual Inspection."
Internal Visual Inspection
NOTICE: Before you proceed with the internal visual inspection described in this section, ensure
that the user has saved all open files and exited all open application programs, if possible.
A simple visual inspection of a system’s interior hardware can often lead to the source of a problem, such as
a loose expansion card, cable connector, or mounting screw. When you perform the visual inspection, see
"System Features
" to locate components referenced in the inspection procedure.
To perform the internal visual inspection, perform the following steps:
1. Turn off the system, including any attached peripherals, and disconnect all the AC power cables from
electrical outlets.
CAUTION: Before beginning to work inside the system, disconnect the power supply from the
power source and the power supply cables from the power supply.
2. Remove the system cover as described in "System Cover."
CAUTION: The microprocessor and heat sink assembly can get extremely hot during system
operations. Be sure that they have had sufficient time to cool before touching them.
CAUTION: When handling the microprocessor and heat-sink assembly, take care to avoid
sharp edges on the heat sink.