Dell Precision T7500 - POST Diagnostic Light Patterns

Pb6
1- Off
2- Green
3- Green
4- Off
- Reserved Reserved
Pb7
1- Off
2- Blink
3- Blink
4- Blink
ACPI S0,
hand off to
BIOS control
System on. BIOS not execution. This is the transition
state to POST states.
Pb8
1- Green
2- Off
3- Off
4- Off
- Reserved Reserved
Pb9
1- Blink
2- Off
3- Off
4- Blink
Non-System
board
Regulator
Failure
A power failure has been detected on a plug-in
component such as VRM, Video Riser, or Memory
Riser.
Pb10
1- Blink
2- Off
3- Blink
4- Off
PSU Failure
PSU may be bad or PSU cable may be crimped
creating a short on a main power rail. (PS_ON
asserted, PS_PWRGOOD not asserted)
Pb11
1- Blink
2- Off
3- Blink
4- Blink
PSU Cable
Failure
All PSU cables may not be properly connected to
system board. (PS_ON asserted, missing a main power
rail)
Pb12
1- Blink
2- Blink
3- Off
4- Off
System
board
Regulator
Failure
A power failure has been detected in one of the
onboard system board regulators. This could be caused
by a failed system board component or by a plug-in
device creating a short on a regulated power rail.
(PS_ON asserted, PS_PWRGOOD asserted,
SYS_PWRGOOD de-asserted)
Pb13
1- Blink
2- Blink
3- Off
4- Blink
Mismatch
Hardware detected a population incompatibility with a
critical system component such as CPU, VRM, PSU, or
MEMORY RISER.
Pb14
1- Green
2- Green
3- Green
4- Off
- Reserved Reserved
Pb15
1- Green
2- Green
3- Green
4- Green
- Reserved Reserved
POST Diagnostic Light Patterns
All POST codes except S0 are accompanied by a Solid Green Power light state. If the power light is not green, see Pre-
POST Diagnostic Light Patterns.
State
Light Pattern
( 1 2 3 4 )
Light
Description
State
Name
State
Assignment
State Description
S0a
1- Off
2- Off
3- Off
4- Off
OFF OFF Power light Off. No power is supplied to the system.
S0e
1- Off
2- Off
3- Off
4- Off
ON
Normal
Operation,
ACPI S0
Power light Solid Green. System has successfully
booted and is operating normally.
S1
1- Off
2- Off
3- Off
4- Solid
RCM
System is in
Recovery
Mode
BIOS checksum failure was detected and the system is
now in recovery mode.
1- Off
2- Off CPU configuration activity is in progress or a CPU