=peanutismint;14031902.. when I plug in the keyboard it either tells me that the device is drawing too much power or that the device is not supported... ..
(I don't have anything plugged into the keyboard's USB hubs so it shouldn't be drawing any more power......)
Well, I haven't seen the video, but I've just done the unthinkable & actually tested it with my old iMac style translucent G3 keyboard
As expected, initially I received the "too much power" message, so plugged in a little
powered 4 port usb hub.
This time the "Cannot Use Device - blah supported" message. So, tap on "OK" to that, open up email, & start typing on old keyboard
Cancelled that, opened "Notes", & again works fine, including the useful characters like ® from pressing the option key.
When I pulled out the CCK usb adapter, whilst still in Notes, up popped the on-screen keyboard.
So, maybe you could try a powered hub? Actually, did you take the message at face value & not actually try editing a document?
Occasionally I've seen an "unsupported" message even with genuine Apple® kit.