I agree with your comments about the bios and the fact it should not matter.
I have several options to wake the machine in the bios, Ethernet only or both Ethernet and WIFI being a couple..
I have selected Ethernet only at this stage.
Strange thing however is that if the Ethernet WOL tick box is not ticked in windows then my machine will flatly refuse to wake.
As soon as i enable any other network device, windows will disable the WOL feature on the Ethernet (not just mine but it appears that everyone's is doing the same).
Even if you enable the WOL feature in the Ethernet and apply settings, then close the windows and then immediately go back again - it's already been disabled again.. (If you have another network device enabled)
My Bios seems to be fine as it does allow WOL to work, but only if the Windows Ethernet WOL tick box is enabled to start with.
I'm happy to have my theory disproved however as long as i can get my WOL to work without having to turn off every other network device first.
Just feels like i'm going round in circles!