Diagnostics - Dell G5 5090 Service Manual

Identifier
Status

Diagnostics

The computer POST (Power On Self Test) ensures that it meets the basic computer requirements and the hardware is working
appropriately before the boot process begins. If the computer passes the POST, the computer continues to start in a normal mode.
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 15. Power LED summary
Amber LED state
Off
Off
Previous State
Blinking
Steady
Off
Table 16. Amber LED blinking failures
Amber LED state
2
2
2
2
Table 17. States Under Host BIOS Control
Amber LED state
2
76 Troubleshooting
GUID-418CA404-DCE7-4FA9-B06C-7BA45BB29B76
Released
White LED state
Off
Blinking
Previous State
Off
Off
Steady
White LED state
1
2
3
4
White LED state
5
System state
S4, S5
S1, S3
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
Description
• Hibernate or Suspend to Disk
(S4)
• Power is off (S5)
System is in a low power state,
either S1 or S3. This does not
indicate a fault condition.
This entry provides for the
possibility of a delay from
SLP_S3# active to PWRGD_PS
inactive.
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.
Boot Failure - This is a system
fault error condition, including
the power supply. Only the
+5VSB rail on the power supply
is working correctly.
This indicates that the host
BIOS has started to execute and
the LED register is now writable.
Description
BIOS Post code (Old LED
pattern 0001) Corrupt BIOS.