65 views and no inputs?
im just leaning towards a short. tested last night and looks like all other ports are fine except for the esata port.
I would suggest testing the board outside the chassis and using the back panel usb ports rather than using a connected front panel (if you are).
As you say, a possible short between board and chassis could be causing the reboots, I have known shorts on eSATA port with I/O shield so it may be worth testing the issue without I/O shield and then re-integrating.
best of luck
mind sharing how you corrected the short circuit problem. taking it out of the chassis is easier said than done in my case so if i can just take care of the short without having to lug this heavy box down to the basement itll be awesome.