Table A-1 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity | Beeps | Possible Cause | Recommended Action | |
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Power LED flashes 12 times, | 12 | Health timer expired. | None. | |
once every second, followed |
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by a two second pause. |
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Beeps stop after third iteration |
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and the computer reboots. |
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System does not power on | None | System unable to power | Press and hold the power button for less than 4 | |
and LEDs are not flashing. |
| on. | seconds. If the hard drive LED turns green, the | |
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| power button is working correctly. Replace the | |
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| system board. | |
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| OR |
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| Press and hold the power button for less than 4 | |
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| seconds. If the hard drive LED does not turn on | |
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| green then: | |
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| 1. | Check that the unit is plugged into a |
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| working AC outlet. |
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| 2. | Ensure that the DC power cable is plugged |
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| into the I/O panel. |
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| 3. | Replace the power supply. |
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ENWW | Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 63 |
