Use a volt meter if you have one. You could try running at super slow clock rate. 100Mhz for example .
I used a volti meter on the plugs themselves (not plugged into the board) and they are all fine.
[2014-06-25 03:43:00] Started cgminer 4.4.1
[2014-06-25 03:43:00] Probing for an alive pool
[2014-06-25 03:43:01] ERR: Asked to memcpy 0 bytes from usbutils.c _usb_read():3075
[2014-06-25 03:43:01] HFA : OP_USB_INIT failed! Operation status 20 (Regulator programming error)
[2014-06-25 03:43:02] Pool 0 difficulty changed to 16
I tried it a 100Mhz and upon starting cgminer it does the same, it within a millisecond the fans/cooler and board seems to power down/restart or something.
Appreciate your help joeltang