I have the same problem with my DP55WG board with the following twist: the machine had been running great since my original build probably 8 months ago. When power is turned on, the only thing that happens is the standby power LSD lights up. I've tried a new power supply. I tried the onboard on-off switch. I tried hooking up the power and reset front panel headers to a different chassis (in case the wires/switch on the existing case had gone bad). No change.
Since it was working one day and not the next, does that definitely indicate that the board has gone bad and needs to be replaced?
thx