Power LED flashes Red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause | Solution | |
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Power failure (power supply is overloaded). | 1. | If equipped with a voltage selector, check that the |
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| voltage selector, located on the rear of the power supply |
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| (some models), is set to the appropriate voltage. Proper |
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| voltage setting depends on your region. |
| 2. | Open the access panel and ensure the power supply |
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| cable is seated into the connector on the system board. |
| 3. | Check if a device is causing the problem by removing |
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| ALL attached devices (such as hard drives or optical |
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| drives and expansion cards). Power on the system. If |
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| the system enters POST, then power off and replace |
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| one device at a time and repeat this procedure until |
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| failure occurs. Replace the device that is causing the |
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| failure. Continue adding devices one at a time to ensure |
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| all devices are functioning properly. |
| 4. | Replace the power supply. |
| 5. | Replace the system board. |
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The incorrect external power supply adapter is being used on | The power supply adapter must be at the correct power | |
the | rating and use the Smart ID technology before the system | |
| will power up. Replace the power supply adapter with the | |
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144 Chapter 8 Troubleshooting Without Diagnostics
