I am wondering how the optos failed. If they just opened up, then the rest of the ETD (including the magjack) should still be operating. If they failed by shorting, then it is possible that 12V got dumped onto the ETD's 5V rail and this can cause a lot of damage. It does appear that something did short which caused his PS to shutdown. He may want to do a few voltage measurements before ordering and attempting to install the new Magjack, especially if one or both of the pics are damaged.