Chapter 7: Troubleshooting
LED Name | Function | Location | Color | Description |
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Power supply | Power supply | On each power | Greenand | Top LED (green) - On means |
status (3) | module status | supply module | Orange | power is good |
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| Middle LED (orange) - On |
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| means there is a fault |
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| condition in this power supply |
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| module |
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| Bottom LED (green) - On |
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| means that AC power to this |
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| power supply module is OK. |
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POST Code | Display boot 80 | On the left back | Each LED | See Post Code Table below |
diagnostic LEDs | POST code | of the system | can be |
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| board | Off, |
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bit2, bit3, bit4, bit5, |
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| Green, |
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bit6, MSB) bottom |
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| Orange, |
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to top |
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| or Red |
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Fan fault | Indicate fan | On each | Orange | On = Fault |
| failure |
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Diagnostic POST LEDs
The BIOS sends a code (in raw binary) to port 80 prior to each POST task. These codes are displayed on eight LEDs, located on the system board, which can be read by the user and can provide troubleshooting information in the event of a system hang during POST. For the location of these LEDs, see “System board” on page 5.
LED reference designator | Bit | Example: Initialize memory | ||
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DS7D2 | 7 | (MSB) |
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DS7D3 | 6 |
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DS7D4 | 5 |
| On | |
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| 0x27 |
DS7D5 | 4 |
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DS7D6 | 3 |
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DS7D1 | 2 |
| On | |
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DS7D2 | 1 |
| On | |
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DS7D3 | 0 | (LSB) | On | |
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202 | www.gateway.com |