On 24/03/18 10:08, Andy Burns wrote:

I bought one, it lights up green when power is on, but not red when
power is off (by reversing the connections I can make it light up red
when on, but still not green when off, so it isn't a case of the LED
being half dead).

Another thought ...

That red might only be visible in standby/sleep state.

When the board is actually powered off, the LED is naturally devoid of
electrons and doesn't light.

--
Adrian C