Hi, ibuiltapc
Good looking set of stuff. Do you use a HDD or is the SSD your only storage?
We've seen this behavior before, and you've covered a lot of the normal troubleshooting steps already. A couple of suggestions:
Have you cleared CMOS? In case some BIOS parameter is in a garbage state, you can force everything to valid default conditions. Use the "CLRTC" jumper and perhaps remove the battery per the users guide.
A continuous START signal could cause these symptons, especially the "pc boots immediately..." There isn't a case/chassis mentioned in the configuration, but is a case front panel connected? Check for shorted power or reset buttons by disconnecting the panel cables. Also tap the motherboard START and RESET buttons a few times.
If these don't help, other members usually come along with more ideas.
Jeff