Table 3. 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 4. 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 5. 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.
2 6 BIOS state 2 BIOS Post code (Old LED
pattern 0010) CPU config or
CPU failure.
Troubleshooting 15
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