Dell Precision Workstation systems have a long history of built-in diagnostic indicators. These can be audible beeps, power buttons that display different states and colors, specific diagnostics LEDs or a combination of them all, in order to indicate at which point during the Power On Self-Test (POST) a system is having issues.
The following article is a reference guide to the codes available on each model and what those codes mean. These change through the various models and years. These indicators are merely a starting point for narrowing down any troubleshooting to be carried out to identify the cause of your current issue. You can use this as a starting point to narrow down the proper troubleshooting guide required, or you can contact technical support for further help and they will be looking for these indicators as well.
With the latest series, the Power Button state now gives a new blink and color shift pattern that uses both Amber and White power LED flashes to indicate where it had a problem. You can identify these systems by the fact that there is no Diagnostics LED block on the front of the unit.
Power Button LED | State | Description |
---|---|---|
Off | Power is Off. LED is blank. | |
Blinking Amber | Initial State of LED at power on. See the table below for Blinking Amber pattern diagnostic suggestions and possible failures. | |
Solid Amber | The second state of the LED at power on, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine. | |
Blinking White | System is in a low-power state, either S1 or S3. This does not indicate a fault condition. | |
Solid White | System is in S0 state. This is the normal power states of a functioning machine. The BIOS turns the LED to this state to indicate it has started fetching op-codes. |
State | State Name | Power Light: Amber Blinking |
Amber Blinking Pattern | Problem Description | Suggested Resolution |
---|---|---|---|---|---|
- | - | 1, 1 | 1 amber blink followed by a short pause, 1 white blink, long pause, then repeats | Bad Motherboard |
|
- | - | 1, 2 | 1 amber blink followed by a short pause, 2 white blinks, long pause, then repeats | Bad Motherboard, Power Supply, or Power Supply cabling |
|
- | - | 1, 3 | 1 amber blink followed by a short pause, 3 white blinks, long pause, then repeats | Bad Motherboard, Memory, or Processor |
|
- | - | 1, 4 | 1 amber blink followed by a short pause, 4 white blinks, long pause, then repeats | Bad Coin Cell Battery |
|
S2 | CPU | 2, 1 | 2 amber blinks followed by a short pause, 1 white blinks, long pause, then repeats | Bad Processor |
|
S1 | RCM | 2, 2 | 2 amber blinks followed by a short pause, 2 white blinks, long pause, then repeats | BIOS ROM Failure |
|
S6 | STO | 2, 3 | 2 amber blinks followed by a short pause, 3 white blinks, long pause, then repeats | No Memory detected |
|
S3 | MEM | 2, 4 | 2 amber blinks followed by a short pause, 4 white blinks, long pause, then repeats | Memory failures |
|
S8 | MEM | 2, 5 | 2 amber blinks followed by a short pause, 5 white blink, long pause, then repeats | Invalid memory installed |
|
S9 | MBF | 2, 6 | 2 amber blinks followed by a short pause, 6 white blinks, long pause, then repeats | Motherboard: Chipset |
|
- | - | 3, 1 | 3 amber blinks followed by a short pause, 1 white blink, long pause, then repeats | RTC Power Failure |
|
S4 | PCI | 3, 2 | 3 amber blinks followed by a short pause, 2 white blinks, long pause, then repeats | PCI Device or Video |
|
- | - | 3, 3 | 3 amber blinks followed by a short pause, 3 white blinks, long pause, then repeats | BIOS Recovery 1 |
|
- | - | 3, 4 | 3 amber blinks followed by a short pause, 4 white blinks, long pause, then repeats | BIOS Recovery 2 |
|
- | - | 4, 1 | 4 amber blinks followed by a short pause, 1 white blink, long pause, then repeats | CPU Configuration or CPU Failure |
|
- | - | 4, 2 | 4 amber blinks followed by a short pause, 2 white blinks, long pause, then repeats | Generic Post Video Error |
|
- | - | 4, 3 | 4 amber blinks followed by a short pause, 3 white blinks, long pause, then repeats | Bad Memory |
|
- | - | 4, 4 | 4 amber blinks followed by a short pause, 4 white blinks, long pause, then repeats | Riser Board Issue |
|
- | - | 4, 5 | 4 amber blinks followed by a short pause, 5 white blinks, long pause, then repeats | PCIe Add-in Card Population Issue |
|
- | - | 4, 6 | 4 amber blinks followed by a short pause, 6 white blinks, long pause, then repeats | RAID Volume degraded |
|
- | - | 4, 7 | 4 amber blinks followed by a short pause, 7 white blinks, long pause, then repeats | System Side cover is missing |
|
With this series, the diagnostics indicator LEDs have been removed. Instead the Power Button state now gives a blink and color shift pattern to indicate where it had a problem. You can identify these systems by the fact that there is no Diagnostics LED block on the front of the unit.
Power Button LED | State | Description |
---|---|---|
Off | Power is Off. LED is blank. | |
Blinking Amber | Initial State of LED at power-on. See the table below for Blinking Amber pattern diagnostic suggestions and possible failures. | |
Solid Amber | The second state of the LED at power-on, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine. | |
Blinking White | System is in a low-power state, either S1 or S3. This does not indicate a fault condition. | |
Solid White | System is in S0 state. This is the normal power states of a functioning machine. The BIOS turns the LED to this state to indicate it has started fetching op-codes. |
State | State Name | Power Light: Amber Blinking |
Amber Blinking Pattern | Problem Description | Suggested Resolution |
---|---|---|---|---|---|
- | - | 2, 1 | 2 blinks followed by a short pause, 1 blink, long pause, then repeats | Bad Motherboard |
|
- | - | 2, 2 | 2 blinks followed by a short pause, 2 blinks, long pause, then repeats | Bad Motherboard, Power Supply, or Power Supply cabling |
|
- | - | 2, 3 | 2 blinks followed by a short pause, 3 blinks, long pause, then repeats | Bad Motherboard, Memory, or Processor |
|
- | - | 2, 4 | 2 blinks followed by a short pause, 4 blinks, long pause, then repeats | Bad coin-cell battery |
|
S1 | RCM | 2, 5 | 2 blinks followed by a short pause, 5 blinks, long pause, then repeats | BIOS Checksum Failure |
|
S2 | CPU | 2, 6 | 2 blinks followed by a short pause, 6 blinks, long pause, then repeats | Bad Processor |
|
S3 | MEM | 2, 7 | 2 blinks followed by a short pause, 7 blinks, long pause, then repeats | Memory failures |
|
S4 | PCI | 3, 1 | 3 blinks followed by a short pause, 1 blink, long pause, then repeats | PCI Device or Video subsystem failures |
|
S5 | VID | 3, 2 | 3 blinks followed by a short pause, 2 blinks, long pause, then repeats | Video Subsystem failure |
|
S6 | STO | 3, 3 | 3 blinks followed by a short pause, 3 blinks, long pause, then repeats | No Memory detected |
|
S7 | USB | 3, 4 | 3 blinks followed by a short pause, 4 blinks, long pause, then repeats | Storage Subsystem failure |
|
S8 | MEM | 3, 5 | 3 blinks followed by a short pause, 5 blinks, long pause, then repeats | Memory configuration or incompatible error |
|
S9 | MBF | 3, 6 | 3 blinks followed by a short pause, 6 blinks, long pause, then repeats | System board failure |
|
S10 | MEM | 3, 7 | 3 blinks followed by a short pause, 7 blinks, long pause, then repeats | Possible memory failure |
|
With this series, the Diagnostic LEDs changed to include a combination of the Power button LED state and the diagnostic LED indicators. The Diagnostic LEDs remain 1, 2, 3, 4, and placed on the front of the unit. You could identify these systems by their flat black and recessed Grill on the front face.
Power Button LED | State | Description |
---|---|---|
Off | Power is Off. LED is blank. | |
Blinking Amber | Initial State of LED at power-on. See the table below for Blinking Amber pattern diagnostic suggestions and possible failures. | |
Solid Amber | The second state of the LED at power-on, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine. | |
Blinking White | System is in a low-power state, either S1 or S3. This does not indicate a fault condition. | |
Solid White | System is in S0 state. This is the normal power states of a functioning machine. The BIOS turns the LED to this state to indicate it has started fetching op-codes. |
State | LED Pattern ( 1 2 3 4 ) |
LED Description | Power LED | State Assignment | State Description |
---|---|---|---|---|---|
Pb0a | Off | System Unplugged | System is not plugged into AC, PSU is not plugged into system board, or control panel not connected to system board. | ||
Pb0b | Off | ACPI S0; Normal Operation | System is on with no failures detected. This is a BIOS-controlled state and is also S0e. | ||
Pb0c | Off | ACPI S1 | Windows Standby State. | ||
Pb1 | Off | ACPI S4 or S5 | Hibernate or Soft off. System plugged in, but either turned off or in Windows Hibernation State. | ||
Pb2 | 3 - Solid | - | Reserved | Reserved | |
Pb3 | 3,4 - Solid | ACPI S3 | Suspend to RAM Windows Standby State. | ||
Pb4 | 2 - Solid | - | Reserved | Reserved | |
Pb5 | 2,4 - Solid | - | Reserved | Reserved | |
Pb6 | 2,3 - Solid | - | Reserved | Reserved | |
Pb7 | 2,3,4 - Flashing On | ACPI S0, hand off to BIOS control | System on. BIOS not execution. This is the transition state to POST states. | ||
Pb8 | 1 - Solid | - | Reserved | Reserved | |
Pb9 | 1,4 - Flashing On | 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 | 1,3 - Flashing On | 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 | 1,3,4 - Flashing On | PSU Cable Failure | All PSU cables may not be properly connected to system board. (PS_ON asserted, missing a main power rail) | ||
Pb12 | 1,2 - Flashing On | 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 | 1,2,4 - Flashing On | Mismatch | Hardware detected a population incompatibility with a critical system component such as CPU, VRM, PSU, or MEMORY RISER. | ||
Pb14 | 1,2,3 - Solid | - | Reserved | Reserved | |
Pb15 | 1,2,3,4 - Solid | - | Reserved | Reserved |
State | LED pattern ( 1 2 3 4 ) |
LED Description | State Name | State assignment | State description | Suggested Resolution |
---|---|---|---|---|---|---|
S0a | Off | OFF | OFF | Power LED Off. No power is supplied to the system. |
|
|
S0e | Off | ON | Normal Operation, ACPI S0 | Power LED Solid Green/Blue or White. System has successfully booted and is operating normally. | ||
S1 | 4 | RCM | System is in Recovery Mode | BIOS checksum failure was detected, and the system is now in recovery mode. |
|
|
S2 | 3 | CPU | CPU | CPU configuration activity is in progress, or a CPU failure was detected. |
|
|
S3 | 3,4 | MEM | Memory | Memory subsystem configuration activity is in progress. Appropriate memory modules were detected, but a memory failure has occurred. |
|
|
S4 | 2 | PCI | PCI device | PCI device configuration activity is in progress, or PCI device failure was detected. |
|
|
S5 | 2,4 | VID | Video Card | Video subsystem configuration activity in progress or video subsystem failure. |
|
|
S6 | 2,3 | STO | Storage | Storage device configuration in progress or storage subsystem failure. |
|
|
S7 | 2,3,4 | USB | USB | USB subsystem configuration activity in progress or USB subsystem failure. |
|
|
S8 | 1 | MEM | Memory | Memory subsystem configuration activity is in progress. No memory modules were detected. |
|
|
S9 | 1,4 | MBF | System board | Fatal system board failure detected. |
|
|
S10 | 1,3 | MEM | Memory | Memory subsystem configuration activity is in progress. Memory modules have been detected but appear to be incompatible or in an invalid configuration. |
|
|
S11 | 1,3,4 | PRV | Other pre-video activity | Indicates routine system activity preceding video initialization. |
|
|
S12 | 1,2 | CFG | Resource configuration | System resource configuration in progress. |
|
|
S13 | 1,2,4 | Reserved | Reserved for future use. This pattern is being considered to indicate the Visual Off state on the Dimension systems. |
|
||
S14 | 1,2,3 | POV | Other post-video activity | Indicates routine system activity after video initialization. |
|
|
S15 | 1,2,3,4 | STD | Boot hand off | Indicates End of POST process. LEDs are normally in this state briefly as POST completes. Once the hand-off to the operating system is done, the LEDs turn off and transition to S0e state. |
|
This series had a combination of Power button LED states with the diagnostic LEDs 1, 2, 3, 4. The diagnostics LEDs are on the front of the chassis.
Off | Blinking Amber | Solid Amber | Solid Green | Blinking Green |
---|---|---|---|---|
Light Pattern | Problem Description |
Suggested Resolution | |
---|---|---|---|
Diagnostic LEDs | Power Button LED |
||
The computer is either turned off or not receiving power. |
|
||
A possible system board failure has occurred. |
|
||
Blinking |
A possible system board, power supply, or peripheral failure has occurred. |
|
|
No CPU present. |
|
||
Memory modules are detected, but a memory power failure has occurred. |
|
||
A possible CPU or system board failure has occurred. |
|
||
BIOS may be corrupt or missing. |
|
||
A possible system board failure has occurred. |
|
||
Power connector not installed properly. |
|
||
Possible peripheral card or system board failure has occurred. |
|
||
A possible system board failure has occurred. |
|
||
A possible coin-cell battery failure has occurred. |
|
||
The computer is in a normal on condition. The diagnostic lights are not lit after the computer successfully boots to the operating system. |
|
||
A possible processor failure has occurred. |
|
||
Memory modules are detected, but a memory failure has occurred. |
|
||
A possible graphics card failure has occurred. |
|
||
A possible floppy drive or hard drive failure has occurred. |
|
||
A possible USB failure has occurred. |
|
||
No memory modules are detected. |
|
||
Memory modules are detected, but a memory configuration or compatibility error has occurred. |
|
||
A possible expansion card failure has occurred. |
|
||
A possible system board resource and/or hardware failure has occurred. |
|
||
Another failure has occurred. |
|
Dell Precision systems have a long history of built-in diagnostic indicators. These can be audible beeps and specific diagnostics LEDs to indicate when during the Power On Self-Test (POST) a system is having issues.
These models had a block of 1, 2, 3, 4, LEDs on the front of the chassis that either lit up Green or were off. A table below is included below with what these indicated. These models were primarily Tower Systems.
LED Pattern (1 2 3 4) |
LED Pattern |
State Name |
State Description |
Suggested Resolution |
---|---|---|---|---|
Off | Off | System POST complete — LED time-out has occurred |
|
|
4 | RCM | BIOS checksum failure — Recovery mode |
|
|
3 | CPU | CPU configuration activity or failure; CPU Cache failure |
|
|
34 | MEM | Memory subsystem configuration activity or failure |
|
|
2 | PCI | PCI device configuration or failure |
|
|
2 4 | VID | Video subsystem configuration or failure |
|
|
23 | STO | Storage device configuration or failure |
|
|
234 | USB | USB subsystem configuration activity or failure |
|
|
1 | No memory detected |
|
||
1 4 | MBF | Fatal system board failure detected |
|
|
1 3 | Memory is detected, configuration, or compatibility error |
|
||
1 34 | PRV | Indicates system activity preceding video initialization |
|
|
12 | CFG | System resource configuration |
|
|
12 4 | Reserved |
|
||
123 | POV | POST complete — Onscreen error message |
|
|
1234 | STD | POST complete — operating system hand-off complete |
|
Beep Code | Description | Suggested Resolution |
---|---|---|
1-1-2 | CPU register test in progress | Contact Technical Support |
1-1-3 | CMOS read/write test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
1-1-4 | BIOS ROM checksum in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
1-2-1 | Timer Test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
1-2-2 | DMA initialization in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
1-2-3 | DMA page register read/write test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
1-3-1 | RAM refresh verification in progress or failure | Troubleshoot the memory and memory slots. |
1-3-2 | 1st 64K RAM test in progress or failure | Troubleshoot the memory and memory slots. |
1-3-3 | 1st 64K RAM chip or data line failure (multi bit) | Troubleshoot the memory and memory slots. |
1-3-4 | 1st 64K RAM odd/even logic failure | Troubleshoot the memory and memory slots. |
1-4-1 | 1st 64K RAM address line failure | Troubleshoot the memory and memory slots. |
1-4-2 | 1st 64K RAM parity test in progress or failure | Troubleshoot the memory and memory slots. |
1-4-3 | Fail-safe timer test in progress | Troubleshoot the memory and memory slots. |
1-4-4 | Software NMI port test in progress | Troubleshoot the memory and memory slots. |
2-1-1 | 1st 64K RAM chip or data line failure - bit 0 | Troubleshoot the memory and memory slots. |
2-1-2 | 1st 64K RAM chip or data line failure - bit 1 | Troubleshoot the memory and memory slots. |
2-1-3 | 1st 64K RAM chip or data line failure - bit 2 | Troubleshoot the memory and memory slots. |
2-1-4 | 1st 64K RAM chip or data line failure - bit 3 | Troubleshoot the memory and memory slots. |
2-2-1 | 1st 64K RAM chip or data line failure - bit 4 | Troubleshoot the memory and memory slots. |
2-2-2 | 1st 64K RAM chip or data line failure - bit 5 | Troubleshoot the memory and memory slots. |
2-2-3 | 1st 64K RAM chip or data line failure - bit 6 | Troubleshoot the memory and memory slots. |
2-2-4 | 1st 64K RAM chip or data line failure - bit 7 | Troubleshoot the memory and memory slots. |
2-3-1 | 1st 64K RAM chip or data line failure - bit 8 | Troubleshoot the memory and memory slots. |
2-3-2 | 1st 64K RAM chip or data line failure - bit 9 | Troubleshoot the memory and memory slots. |
2-3-3 | 1st 64K RAM chip or data line failure - bit A | Troubleshoot the memory and memory slots. |
2-3-4 | 1st 64K RAM chip or data line failure - bit B | Troubleshoot the memory and memory slots. |
2-4-1 | 1st 64K RAM chip or data line failure - bit C | Troubleshoot the memory and memory slots. |
2-4-2 | 1st 64K RAM chip or data line failure - bit D | Troubleshoot the memory and memory slots. |
2-4-3 | 1st 64K RAM chip or data line failure - bit E | Troubleshoot the memory and memory slots. |
2-4-4 | 1st 64K RAM chip or data line failure - bit F | Troubleshoot the memory and memory slots. |
3-1-1 | Secondary DMA register test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-1-2 | Primary DMA register test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-1-3 | Primary IMR test in progress or failure | Contact Technical Support |
3-1-4 | Secondary IMR test in progress or failure | Contact Technical Support |
3-2-2 | Interrupt vector loading in progress | Contact Technical Support |
3-2-4 | Keyboard controller test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-3-1 | CMOS power fail and checksum test in progress | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-3-2 | CMOS Config info validation in progress | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-3-3 | RTC/Keyboard controller not found | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-3-4 | Screen memory test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-4-1 | Screen initialization test in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-4-2 | Screen retrace tests in progress or failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
3-4-3 | Search for video ROM in progress | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
4-2-1 | Timer tick interrupt test in progress or failure | Contact Technical Support |
4-2-2 | Shut down test in progress or failure | Contact Technical Support |
4-2-3 | Gate A20 failure | Contact Technical Support |
4-2-4 | Unexpected interrupt in Protected Mode | Contact Technical Support |
4-3-1 | RAM test in progress or failure above address 0FFFFh | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
4-3-2 | No memory in Bank 0 | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
4-3-3 | Interval Timer Channel 2 test in progress or failure | Contact Technical Support |
4-3-4 | Time-Of-Day Clock test in progress or failure | Contact Technical Support |
4-4-1 | Super I/O chip failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
4-4-4 | Cache test failure | Run the Dell Diagnostics. For more information, reference Resolve Hardware Issues With Integrated and Online Diagnostics (SupportAssist ePSA, ePSA, or PSA Error Codes) . |
See the table for definitions of the acronyms within this article.
Acronym | Definition |
---|---|
BIOS | Basic Input/Output System |
CFG | Resource Configuration |
CPU | Central Processing Unit |
DIMM | Dual In-line Memory Module |
DMA | Direct Memory Access |
EC | Embedded Controller |
HECI | Host Embedded Controller Interface |
LCD | Liquid Crystal Display |
LED | Light Emitting Diode |
MBF | Motherboard Failure |
MBIST | Memory Built-in Self-Test |
ME | Management Engine |
MEM | Memory |
NVRAM | Non-Volatile Random Access Memory |
PCI | Peripheral Component Interconnect |
POV | Post-video Activity |
PRV | Pre-video Activity |
PSU | Power Supply Unit |
RAM | Random Access Memory |
RCM | Recovery Mode |
ROM | Read Only Memory |
RTC | Real Time Clock |
S0 | System Power State S0 - This is the Working State, where your Windows computer is awake. |
S1 | System Power State S1 - In this sleep state, the CPU is stopped, and your computer is in standby mode. |
S2 | System Power State S2 - This state is similar to S1 except that the CPU and system cache are lost because the processor loses power. |
S3 | System Power State S3 - In this state, data is saved to RAM, hard drives, and other hardware are shut down. |
S4 | System Power State S4 - In this state, RAM, and other data are saved to the hard disk. |
S5 | System Power State S5 - The System is off. |
SBIOS | Small Board Interface Operating System |
SPI | Serial Peripheral Interface |
STD | Boot Hand Off |
STO | Storage Device |
TPM | Trusted Platform Module |
USB | Universal Serial Bus |
VID | Video |
If you require further assistance, contact Dell Technical Support.
Here are some recommended articles related to this topic that might be of interest to you.