Hey I just made a thread about this exact same issue here.
This is from the manual for the X27D. My Opus 150 has a two pin wire meant to go to the "power on" pins for my motherboard, but I'm not 100% sure where to go. The PS connector's green wire is supposed to be positive and white wire is supposed to be negative. My best guess is:
white: pin 6
green: pin 8
Is this correct?
edit: no, this isn't correct, read down
1999 SVT Contour
Opus tech support is super helpful.
Green to pin 6
White to pin 8
Just tested it on my shuttle K45 and it works fine