Dell OptiPlex 5070 Small Form Factor Service Manual - Page 68

Diagnostics - specs

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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 White LED state Off Off Off Blinking System state S4, S5 S1, S3 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. Previous State Blinking Previous State Off S3, no PWRGD_PS S0, no PWRGD_PS 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. 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 This indicates that the host fetch = 1 BIOS has started to execute and the LED register is now writable. Table 4. Amber LED blinking failures Amber LED state White LED state 2 1 2 2 2 3 System state Bad MBD Bad MB, PSU or cabling Bad MBD, DIMMS, or CPU 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] 68 Troubleshooting

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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
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]
68
Troubleshooting