Not working unless its in windows/OS

[thefunkygibbon]

Would a digispark, acting as a keyboard start doing its job as soon as it has power or does it need some kind of OS level initialisation before it starts?

I ask because I bought one to press F1 constantly to bypass bios errors in my server, but even though the light comes on to show power, it doesnt seem to be doing what it should be doing. Plugging it into my windows PC I can see the button being pressed correctly.