Basic Troubleshooting
Interpreting the Diagnostic Lights
Compaq computers feature diagnostic lights or LEDs (light emitting diodes) to indicate various computer states or errors. The following tables describe the diagnostic light indications. Refer to the Troubleshooting Guide on the Compaq Reference Library CD for more information.
Computer LEDs
LED | Color | LED Activity | State/Message |
Power | Green | On | (S0) Computer on |
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Power | Green | 1 flash every 1 second | (S1) Normal suspend mode |
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Power | Green | 1 flash every 2 seconds | (S3) Suspend to RAM |
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| (ifapplicable) |
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Power | Green | 1 flash every 4 seconds | (S4) Suspend to disk |
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| (ifapplicable) |
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Power | Clear | Off | (S5) Computer off |
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Power | Red or | 4 flashes every 1 second, | CPU thermal shutdown |
| Yellow* | or 2 flashes 1 second |
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| apart followed by a 2 |
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| second pause |
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Power | Red or | On | CPU not installed or |
| Yellow |
| incorrect processor |
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| installed |
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Power | Red or | 1 flash every second | ROM error |
| Yellow |
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Power | Red or | 1 flash every 2 seconds | Power supply overload |
| Yellow |
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Network Controller | Green | On | Network link (Evo Workstation |
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| W8000 only) |
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Network Controller | Green | Flashing | Network activity (Evo |
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| Workstation W8000 only) |
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Hard Drive | Green | Flashing | Hard drive activity |
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*Power LED may not flash on some models. |
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Getting Started |
