I have dual power supplies running my computer. I have the ATX which boots from the momentary switch on the front panel. I also have an AT power supply that runs the big current drawing components, which has to be turned on manually and turned off manually.
I was planning on using a transistor to 'amplify' the power from this Power LED to get enough volts to turn on a Solid State Relay, so that I'd only have to turn on my computer with one switch and shut off the same.
I'm planning on using this Power LED output to 'Base' the transistor as it's the first light to come on, and the last to go off.