Table 9-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity | Beeps | Possible Cause | Recommended Action |
Red Power LED flashes five | 5 |
times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module.
1.Reseat DIMMs.
2.Replace DIMMs one at a time to isolate the faulty module.
3.Replace
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| 4. | Replace the system board. |
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Red Power LED flashes six | 6 | For systems with a graphics card: | ||
times, once every second, |
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| 1. | Reseat the graphics card. |
followed by a two second |
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pause. Beeps stop after fifth |
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| 2. | Replace the graphics card. |
iteration but LEDs continue until |
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problem is solved. |
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| 3. | Replace the system board. |
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| For systems with integrated graphics, replace the | |
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| system board. | |
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Red Power LED flashes seven | 7 | System board failure | Replace the system board. | |
times, once every second, |
| (ROM detected failure |
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followed by a two second |
| prior to video). |
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pause. Beeps stop after fifth |
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iteration but LEDs continue until |
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problem is solved. |
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Red Power LED flashes eight | 8 | Invalid ROM based on | 1. | Reflash the system ROM with the latest BIOS |
times, once every second, |
| bad checksum. |
| image. See the “Boot Block Emergency |
followed by a two second |
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| Recovery Mode” section of the Desktop |
pause. Beeps stop after fifth |
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| Management Guide for more information. |
iteration but LEDs continue until |
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| 2. | Replace the system board. |
problem is solved. |
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Red Power LED flashes nine | 9 | System powers on but is | 1. | Check that the voltage selector, located on |
times, once every second, |
| unable to boot. |
| the rear of the power supply (some models), |
followed by a two second |
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| is set to the appropriate voltage. Proper |
pause. Beeps stop after fifth |
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| voltage setting depends on your region. |
iteration but LEDs continue until |
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| 2. | Unplug the AC power cord from the |
problem is solved. |
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| computer, wait 30 seconds, then plug the |
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| power cord back in to the computer. |
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| 3. | Replace the system board. |
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| 4. | Replace the processor. |
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Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 193
