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 the |
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| system enters POST, then power off and replace one |
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| device at a time and repeat this procedure until failure |
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| occurs. Replace the device that is causing the failure. |
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| Continue adding devices one at a time to ensure all |
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| devices are functioning properly. |
| 4. | Replace the power supply. |
| 5. | Replace the system board. |
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Solving hard drive problems
Hard drive error occurs.
Cause | Solution |
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Hard disk has bad sectors or has failed. | 1. In Windows 7, click Start, click Computer, and right- |
| click on a drive. Select Properties, and then select the |
| Tools tab. Under |
| In Windows 8, on the Start screen type e, and then |
| select File Explorer from the list of applications. In the |
| left column, expand Computer, |
| select Properties, and then select the Tools tab. Under |
| Error checking click Check. |
| 2. Use a utility to locate and block usage of bad sectors. If |
| necessary, reformat the hard disk. |
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Solving hard drive problems | 85 |