Windows Intellipanel Borked My Motherboard! (I think..?)

Hi Guys, I thought I'd go "green" and get one of these so that my screens and speakers turn off when the PC isn't on.

I ran through the recommended "training cycle" - where the intellipanel learns the power usage of your PC, so knows when it's off. All okay, PC starts up and shuts down, no problems.

However, when I tried to turn it back on, the fans spin, the power light comes on, and that's it.
There's no signal to the Monitors (tried different monitors and tried the Graphics card in another PC, all okay) and only one beep from the system speaker I yoinked out of my old system - no error beeps.

It's only got the bare minimum in at the moment (one stick of RAM, one HDD, etc), but I can't think of anything else to try.
Is there anything? Or am I looking at a new motherboard?

Edit: I've done BIOS reset, removed the battery, all that Jazz too...

 

I'd try a new PSU too. (I'm assuming you've tried unplugging it from the Intellipanel?)

 

I've been using an IntelliPlug for months now, no problem. S3 sleep uses so little power it turns the monitor, speakers and printer off altogether so I now use that instead of fully off.