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The PC runs but the power LED is not lit
Explanation: The system has power and is able to start up, but the power LED is not lit up.
Diagnosis: If this is a system that was just put together, then the LED was probably connected incorrectly. On an existing system, the cable connecting the LED to the motherboard was probably jarred loose. The LED could also be burned out, although this rarely happens, even after years and years.