ATX Power Supply Conversion
Angled view of this project at this point. You can see the purple wire near the rear connecting to the leftmost LED. That LED is for "Standby", and is hooked up between 5V standby and GND. It lights whenever I have the power supply plugged in to the wall. The other light is connected to PWR_OK, which is the gray wire running by the big torroid. The PWR_OK wire goes to 5V when the power supply detects that everything is running ok. It reminds me that I have the power supply turned on.