Gateway GT5058 makes a clicking sound, similar to the sound a hard drive makes when it's really working, is heard when the power is off. The clicking sound is heard through the system's external speakers if they are left on. The lights on the ethernet adapter light up as if there is network activity. Unplugging the power cord stops the sound, as does powering up the PC. It seems the clicking sound is coming from the power supply unit. Is it time to replace the power supply?
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