Quoted from CyberNinja24:
I found what appears to be a fried (or certainly tarnished) connector at J101, I believe. Could this be my issue? I've never seen anything like this before. Is this the burnet molex
Definitely a possibility.
One possible test is to insert J101's IDC 1/2 to 3/4s of the way and see if it resets.
If it doesn't, you need to replace both the connector and the header on the PCB at J101 (use a temperature controlled soldering station and solder at 750 degrees F--or send the board out for repair to someone like Chris Hibler or Borygard who post here).
But really, there's no alternative here but to go through all the steps in PinWiki methodically one-by-one and rule each one out in sequence one-by-one.
If you need equipment links to tackle this, just ask.
Many helpful responders here.