We have such strange problem with a PC. When pushing a power button - no effect. Coolers do not run, no voltage on power wires. When we close an Wake Up On LAN connectors coolers start to run, voltage appear on power wires, but no POST beeps and no video.

We looked over all the computer many times, we disconnected all the cards, memory, BUT NO POST signals.

There are no visual damages on motherboard, all caps looks like ok.

What to do in this situation? Is this MB repairble or not?