Troubleshooting
Using the System Board LEDs for Troubleshooting
Table 2-2. Interpreting the System Board LEDs
LED Name | LED’s Color | Description |
| When On |
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VRM0 | Green | This light, when on, indicates that the |
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| voltage regulator module is working |
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| correctly for processor zero. The |
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| default state for this light is on. |
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FETCH | Green | This light, when on, indicates that one |
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| or both processors is fetching code. The |
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| default state for this light is on. |
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FANS | Yellow | Note that the yellow light blinks a |
| (blinking) | heart beat when the system is working |
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| correctly. See Table |
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| details for interpreting the blinks of |
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| this light. |
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Over Current | Red | This light, when on, indicates there is |
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| a short somewhere in the system. The |
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| default state for this light is off. |
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There are six LED blink sequences supported by the System Controller. The LED blink sequences are shown in Table
If the FANS LED is ever stuck either ON or OFF, a system problem has occurred. This system problem is most likely an I2C bus hang. A potential fix may be to check that the power supply cables are correctly plugged in. If this does not work, call you local HP Support Representative.
Table 2-3. Blink Sequences for the FANS LED
Blink | LED Blink Sequence | Description |
Sequence | (black dot represents 0.1 second LED on; white dot |
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Number | is 0.1 second LED is off) |
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System Controller |
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1 | ● ❍ ● ❍ ❍ ❍ ❍ ❍ ❍ ❍ | System controllers |
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| normal heart beat. |
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2 | ● ● ● ● ● ❍ ❍ ❍ ❍ ❍ | This is a transient |
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| state shown by the |
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| system controller at |
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| power up. |
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3 | ● ● ● ● ● ● ● ● ● ● ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ ❍ | System controller’s |
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| transient state. |
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| There is no system |
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| problem. |
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70 | Chapter 2 |
