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. | Check that the voltage selector, located on the rear of |
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| the power supply (some models), is set to the |
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| appropriate voltage. Proper voltage setting depends on |
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| your region. |
| 2. | Open the hood and ensure the 4- or |
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| supply cable is seated into the connector on the system |
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| board. |
| 3. | Check if a device is causing the problem by removing |
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| ALL attached devices (such as hard, diskette, or optical |
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| drives, and expansion cards). Power on the system. If |
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| the system enters the POST, then power off and |
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| replace one device at a time and repeat this procedure |
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| until failure occurs. Replace the device that is causing |
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| the failure. Continue adding devices one at a time to |
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| ensure 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 USDT power supply adapter must be at 135W and use | |
the USDT. | the Smart ID technology before the system will power up. | |
| Replace the power supply adapter with the | |
| USDT power supply adapter. | |
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