uSDC20D Not powering/shutting down computer.
I have a problem with my uSDC not powering up my computer. I have wired it into my car as per the diagram with the one exception of the optional computer sense line. When ever I turn ignition or the override switch the stereo (also connected to this line) turns on the but the computer doesnt seem to receive a pulse to turn it on.
I have checked and has a sparky friend look at but can't work out where I may have gone wrong. Does anyone have any advice about how to go about fixing this issue.
http://www.mpegbox.com/microsdc/usdc20d_InputCS.pdfs ; its sceme F