In early 2015, I built a FreeNAS box using a ASRock C2550D4I motherboard. It worked great until July of this year, when it suddenly refused to boot. ASRock RMA'd it and the new board has worked fine... until today. I got home from work, and I could hear a fan inside the case tapping against a small wire that had become dislodged from its out-of-the-way position. Easy, fix, I thought.

I powered down the machine, unplugged the power, opened it up, and tucked the wire away from the fan. Didn't even touch the motherboard or any of the components inside. Then I closed it back up, plugged in the power, and... nothing. The fans don't turn on, even briefly. The power button does absolutely nothing. IPMI is working, but on the "Power Control and Status" page, it says "Host is currently off." When I try to perform the "Power on server" action, it just fails without giving me a clue why.

Does anyone have any idea what might be going on here? I greatly appreciate it.