Dell 8DEHV7YR Service Manual page 71

However, if the computer fails the POST, the computer emits a series of LED codes during the start-up. The system LED is integrated on
the Power button.
The following table shows different light patterns and what they indicate.
Table 3. Power LED summary
Amber LED state
Off
Off
Previous State
Blinking
Steady
Off
Table 4. Amber LED blinking failures
Amber LED state
2,1
2,2
2,3
2,4
Table 5. States Under Host BIOS Control
Amber LED state
2,5
2,6
2,7
3,1
White LED state
Off
Blinking
Previous State
Off
Off
Steady
White LED state
White LED state
System state
S5
S3, no PWRGD_PS
S3, no PWRGD_PS
S0, no PWRGD_PS
S0, no PWRGD_PS, Code fetch
= 0
S0, no PWRGD_PS, Code fetch
= 1
System state
Bad MBD
Bad MB, PSU or cabling
Bad MBD, DIMMS, or CPU
Bad coin cell
System state
BIOS state 1
BIOS state 2
BIOS state 3
BIOS state 4
Notes
This entry provides for the
possibility of a delay from
SLP_S3# active to PWRGD_PS
inactive.
This indicates that the host BIOS
has started to execute and the
LED register is now writable.
Notes
Bad MBD - Rows A, G, H, and J
from table 12.4 of SIO Spec -
Pre-Post indicators [40]
Bad MBD, PSU or PSU cabling -
Rows B, C and D of table 12.4
SIO spec [40]
Bad MBD, DIMMS or CPU -
Rows F and K from table 12.4 of
SIO spec [40]
Bad coin cell - Row M of table
12.4 in SIO spec [40]
Notes
BIOS Post code (Old LED
pattern 0001) Corrupt BIOS.
BIOS Post code (Old LED
pattern 0010) CPU config or
CPU failure.
BIOS Post code (Old LED
pattern 0011) MEM config in
process. Appropriate mem
modules detected but failure has
occurred.
BIOS Post code (Old LED
pattern 0100) Combine PCI
device config or failure with
Troubleshooting 71