I've searched but couldn't find the answer.
When attempting to power up my M4, by following this guide, when I turn on the desktop PSU the D2 light next to the J6 jumper blinks.
It blinks before I even throw the switch between the desktop PSU and the M4. As soon as the desktop PSU turns on, that light blinks but no power to the carputer. What does this mean? Any idea what I might be doing wrong?