If the front panel lights are on and the power supply fan is running, but no other system action is occurring, you should consider the power supply as one of the most likely sources of such a problem.
The presence of the lights and the fan operation indicate that power is reaching the system and that at least some portion of the power supply is functional. This type of symptom results from the following two likely possibilities:
1. A portion of the power supply has failed, or is being overloaded. One or more of the basic voltages supplied by the power supply is missing while the other are still present.
2. A key component on the system board has failed, preventing it from processing, even though the system has power. A defective capacitor across the power input of the system board can completely prevent it from operating.
Check the power supply by substitution. If the power supply is not the cause of the dead system, one of the other components must be overloading the portion of the power supply. You must sort out which component is causing the problem.
The presence of the lights and the fan operation indicate that power is reaching the system and that at least some portion of the power supply is functional. This type of symptom results from the following two likely possibilities:
1. A portion of the power supply has failed, or is being overloaded. One or more of the basic voltages supplied by the power supply is missing while the other are still present.
2. A key component on the system board has failed, preventing it from processing, even though the system has power. A defective capacitor across the power input of the system board can completely prevent it from operating.
Check the power supply by substitution. If the power supply is not the cause of the dead system, one of the other components must be overloading the portion of the power supply. You must sort out which component is causing the problem.
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