I’m in the same boat with an X10SDV. I went down the rabbit hole for ACPI and the super micro troubleshooting docs but I haven’t been successful. If you are accessing IPMI then you’re ahead of me.
I would check every single jumper and look for any obvious signs of short circuits like scorch marks.
Otherwise good luck!
Thanks for the notes! I’ll look around for this post card. I have power and IPMI LEDs looking happy but only after I latch power by shorting the ATX connector to ground and skipping the power button header.