Table 19. Power LED summary
Amber LED state White LED state System state Notes
Off Off S4, S5
● Hibernate or Suspend to
Disk (S4)
● Power is off (S5)
Off Blinking S1, S3
System is in a low power
state, either S1 or S3. This
does not indicate a fault
condition.
Previous State Previous State S3, no PWRGD_PS This entry provides for
the possibility of a delay
from SLP_S3# active to
PWRGD_PS inactive.
Blinking Off S0, no PWRGD_PS
Boot Failure - The computer is
receiving electrical power, and
power supplied by the power
supply is normal. A device
might be malfunctioning or
incorrectly installed. Refer to
the table below for Amber
Blinking Pattern diagnostics
suggestion and possible
failures.
Steady Off S0, no PWRGD_PS, Code
fetch = 0
Boot Failure - This is a system
fault error condition, including
the power supply. Only the
+5VSB rail on the power
supply is working correctly.
Off Steady S0, no PWRGD_PS, Code
fetch = 1
This indicates that the host
BIOS has started to execute
and the LED register is now
writable.
Table 20. Amber LED blinking failures
Amber LED state White LED state System state Notes
2 1 Bad MBD Bad MBD - Rows A, G, H, and
J from table 12.4 of SIO Spec
- Pre-Post indicators [40]
2 2 Bad MB, PSU or cabling Bad MBD, PSU or PSU
cabling - Rows B, C and D of
table 12.4 SIO spec [40]
2 3 Bad MBD, DIMMS, or CPU Bad MBD, DIMMS or CPU -
Rows F and K from table 12.4
of SIO spec [40]
2 4 Bad coin cell Bad coin cell - Row M of table
12.4 in SIO spec [40]
Table 21. States Under Host BIOS Control
Amber LED state White LED state System state Notes
2 5 BIOS state 1 BIOS Post code (Old LED
pattern 0001) Corrupt BIOS.
Troubleshooting 81
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