Solving power problems
Common causes and solutions for power problems are listed in the following table.
Table
Power supply shuts down intermittently.
Cause | Solution |
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Voltage selector switch on rear of workstation chassis (some | Select the proper AC voltage using the selector switch. |
models) not switched to correct line voltage (115V or 230V). |
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Power supply will not turn on because of internal power supply | Replace the power supply. |
fault. |
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Workstation powered off automatically and the Power LED flashes Red two times, once every second, followed by a two second pause, and the workstation beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause | Solution | ||
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Processor thermal protection activated: | 1. | Ensure that the workstation air vents are not blocked and | |
A fan may be blocked or not turning. |
| the processor cooling fan is running. | |
2. | Open hood, press power button, and see if the processor | ||
OR | |||
| fan spins. If the processor fan is not spinning, make sure | ||
The heatsink is not properly attached to the processor. |
| the fan's cable is plugged onto the system board header. | |
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| ||
| 3. | If fan is plugged in, but is not spinning, then replace the | |
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| heatsink/fan assembly. | |
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Power LED flashes Red four times, once every second, followed by a two second pause, and the workstation 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 the |
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| power supply (some models), is set to the appropriate |
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| voltage. Proper voltage setting depends on your region. |
| 2. | Open the hood and ensure the 4- or |
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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 ALL |
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| attached devices (such as hard, diskette, or optical drives, |
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| and expansion cards). Power on the system. If the system |
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| enters the POST, then power off and replace one device |
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| at a time and repeat this procedure until failure occurs. |
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| Replace the device that is causing the failure. Continue |
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| adding devices one at a time to ensure all devices are |
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| functioning properly. |
| 4. Replace the power supply. | |
| 5. | Replace the system board. |
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126 Appendix D Troubleshooting without diagnostics | ENWW |