The following table shows different light patterns and what they indicate.
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.
Troubleshooting
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