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I've noticed that the lights flicker occasionally in my office and sometimes when they do, the PC will hang or reboot
Explanation: The PC is exhibiting instability or strange behavior at the same time that other symptoms of power fluctuation are apparent.
Diagnosis: Low quality input power to the PC is causing it to behave erratically. Flickering lights means either power grid problems (brownouts, electrical storms), poor wiring in the building, or draw from large electricity-using devices, especially air conditioners.