Dell DR4000 Owner's Manual page 20

Table 1-3. Diagnostic Indicator Codes
Code
20
About Your System
Causes
The system is in a normal
off condition or a possible
pre-BIOS failure has
occurred.
The diagnostic lights are
not lit after the system
successfully boots to the
operating system.
The system is in a normal
operating condition
after POST.
BIOS checksum failure
detected; system is in
recovery mode.
Possible processor failure. See "Troubleshooting Processors"
Memory failure.
Possible expansion card
failure.
Possible video failure.
Hard drive failure.
Possible USB failure.
Corrective Action
Plug the system into a working
electrical outlet and press the
power button.
Information only.
See "Getting Help" on page 149.
on page 136.
See "Troubleshooting System
Memory" on page 129.
See "Troubleshooting Expansion
Cards" on page 134.
See "Getting Help" on page 149.
Ensure that the hard drives are
properly connected. See "Hard
Drives" on page 63 for
information on the drives
installed in your system.
See "Troubleshooting a USB
Device" on page 122.