Diagnostics - Dell OptiPlex 5070 Micro Service Manual

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 3. Power LED summary
Amber LED state
Off
Off
Previous State
Blinking
Steady
Off
Table 4. Amber LED blinking failures
Amber LED state
2
2
2
46 Troubleshooting
White LED state
Off
Blinking
Previous State
Off
Off
Steady
White LED state
1
2
3
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
Notes
● 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.
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]