![A off, B off, C off, D off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_1.jpeg) ![1 off, 2 off, 3 off, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_2.jpeg) |
OFF |
- AC power not available, the system is unplugged from the wall, or power cables are not installed correctly.
- On some systems, the diagnostic lights are not lit after the system successfully boots into the operating system.
- The system is in a normal operating condition after POST.
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- Confirm that the AC power cable is plugged securely into the outlet and power supply.
- If able, reseat the power supply in the chassis.
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![1 off, 2 off, 3 lit green, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_4.jpeg) |
CPU |
CPU configuration activity is in progress, or a CPU failure was detected. |
- Inspect the processor and heat sink for damage.
- Clear the NVRAM.
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![A lit yellow, B lit yellow, C lit green, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_5.jpeg) ![1 off, 2 off, 3 lit green, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_6.jpeg) |
MEM |
Memory subsystem configuration activity is in progress, or a memory failure was detected. |
- Reseat the memory and verify it is in the correct configuration.
- Test each memory module individually in each socket to isolate a module or socket problem.
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![A lit yellow, B lit green, C lit yellow, D lit yellow](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_7.jpeg) ![1 off, 2 lit green, 3 off, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_8.jpeg) |
PCI |
PCI device configuration activity is in progress, or PCI device failure was detected. |
- Clear the NVRAM.
- Remove all external devices and expansion cards. Replace each device one at time until the faulty device is isolated.
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![A lit yellow, B lit green, C lit yellow, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_9.jpeg) ![1 off, 2 lit green, 3 off, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_10.jpeg) |
VID |
Video subsystem configuration activity in progress or video subsystem failure |
- Reseat the video card if possible.
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![A lit yellow, B lit green, C lit green, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_11.jpeg) ![1 off, 2 lit green, 3 lit green, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_12.jpeg) |
USB |
USB subsystem configuration activity in progress or USB subsystem failure. |
- Disconnect all USB devices. Reconnect each device one at time until the fault is found.
- Clear the NVRAM.
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![A lit green, B lit yellow, C lit yellow, D lit yellow](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_13.jpeg) ![1 lit green, 2 off, 3 off, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_14.jpeg) |
MEM2 |
Memory was not detected. |
- Reseat the memory.
- Try known good memory if available.
- Test each memory module individually in each socket to isolate a module or socket problem.
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![A lit green, B lit yellow, C lit yellow, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_15.jpeg) ![1 lit green, 2 off, 3 off, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_16.jpeg) |
MBF |
Fatal motherboard failure detected. |
- Clear the NVRAM.
- Remove all external devices.
- Remove all expansion cards.
- Disconnect all drives.
- Inspect the heat sink and processor.
- If the server POSTs with all the devices out, reconnect them one at a time until the faulty device is isolated.
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![A lit green, B lit yellow, C lit green, D lit yellow](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_17.jpeg) ![1 lit green, 2 off, 3 lit green, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_18.jpeg) |
MEM3 |
Memory configuration or compatibility error. |
- Reseat and confirm that the memory is in the correct configuration. Remove any recently added memory.
- Try known good memory if available.
- Test each memory module individually in each socket to isolate a module or socket problem.
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![A lit green, B lit yellow, C lit green, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_19.jpeg) ![1 lit green, 2 off, 3 lit green, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_20.jpeg) |
PRV |
Indicates routine system activity preceding video initialization. |
- Clear the NVRAM.
- Remove all external devices and expansion cards. Replace each device one at time until the faulty device is isolated.
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![A lit green, B lit green, C lit yellow, D lit yellow](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_21.jpeg) ![1 lit green, 2 lit green, 3 off, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_22.jpeg) |
CFG |
System resource configuration in progress. |
- Clear the NVRAM.
- Remove all external devices and expansion cards. Replace each device one at time until the faulty device is isolated.
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![A lit green, B lit green, C lit green, D lit yellow](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_23.jpeg) ![1 lit green, 2 lit green, 3 lit green, 4 off](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_24.jpeg) |
POV |
Indicates routine system activity after video initialization. |
- Clear the NVRAM.
- Verify that all drives are properly connected.
- Remove all external devices and expansion cards. Replace each device one at time until the faulty device is isolated.
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![A lit green, B lit green, C lit green, D lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_25.jpeg) ![1 lit green, 2 lit green, 3 lit green, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_26.jpeg) |
STD |
Indicates End of POST process. LED's remain in this pattern after POST, until system is switched off or reset. |
- If there is no video, check the KVM and monitor configuration.
- If not booting to the operating system, check for hard drive and software errors.
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![1 off, 2 off, 3 off, 4 lit green](https://supportkb.dell.com/img/ka06P000000CgS3QAK/ka06P000000CgS3QAK_en_US_27.jpeg) |
BIOS |
BIOS checksum failure detected; system is in recovery mode. |
- Clear the NVRAM.
- Remove all external devices and expansion cards. Replace each device one at time until the faulty device is isolated.
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