This LED will be ON when the computer is turned on and the power supply is working correctly. LED 2 Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned off and your power supply is working correctly. LED 1 Indicates that trickle voltage from the power supply has been detected. You'll find them just to the right of the memory slots, and sit behind the SATA cable where it comes out of the connector. Bummer! You'll need to open it up to check your cable and locate the diagnostic LEDS to see what they tell you.
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