I picked up a donated motherboard/CPU from a fellow TriLUGer and popped it into my Myth box last night to see if it would fire up. Fire might be an apt word, as the motherboard did exactly nothing while I had it powered.
After I checked connections and powered it up again, I gave up on it and put the power supply back on my existing motherboard. When I plugged it back in, I got a huge power surge that nearly tripped my UPS. My power supply clearly didn’t like being tethered to that questionable motherboard.
The good news is my power supply is still okay. After its surge, it booted my Myth box fine. Now I need to find a new donated motherboard/CPU for my project. Hey, it was worth a try!