What bios version fixed this? I'm going through this nightmare right now. I have REV 2 of the same motherboard though.
The system wakes up whenever it wants to. 1 out of 3 times it will exhibit the behavior you have described. Upon wake up (by any source, wake on LAN, ON/OFF switch, etc...) both the LEDs on the MB & my case fan will go on for a few seconds, then OFF, then ON, then ON and stay ON without getting to POST. The monitor never turns on.
It's frustrating.