If there is like...a message LED on the board or something that turns on when the system goes to sleep...you could tap a lead from that, tie it into a circuit so that when that Sleep Lead goes HIGH the Neon gets shut off.
Read up on your motherboard of course.
You could also uh...tap into the power cables themselves...measure the current draw of the devices that goto sleep...so when they goto sleep, the power drops off, the circuit goes and turns off the Neon.
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