Architect,
NOW I understand the Valet switch. That's a good idea. I like it!
I don't know what to tell you on the power supply issue. Have you powered up the board with a known good power supply out of a desktop or such? If you're using the Opus for testing, do you have 12 volts at the main feed as well as at the ignition wire? Are there any led's on the Opus to indicate its status? Also try flipping the "power on" wire from the Opus to the motherboard. Some are sensitive to polarity and won't turn on if the polarity is backwards. Keep us posted!