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Andy Burns[_13_]

wrote:

I don't think the LEDs will come to any harm if you just stick them
on the relevant pins and see what works.
Hmmm, have probed them with a multimeter ...

When the machine is on, the on-board LED is green, pin 2 is at +5V and
pin4 is at 0V, so the green external LED shows "on" as expected.

When the machine is asleep (or is shutdown) the on-board LED is amber
and both pins 2 and 4 are are at +5V which explains why neither colour
of the external LED across them is lit.

I can't see how the external LED can show red for "off" when connected
as per the manual. There's no setting in BIOS to let machine know it
has a bi-colour LED available.