Problem switching a 5V mini relay from a low power LED (1,2v 2 mA) input

I am trying to make a 5V mini relay switch when the HDMI indicator
LED
in my DVD player lights up.

I have unsuccesfully tried to trigger the mini relay (5V, 40mA) via
an
optocoupler (4N33 - infrared/darlington) "piggybagged" on the
indicator LED (1,2V 2mA), but the relay doesn't switch, only "hums"
slightly. Supplying an input of 1,5V from before the indicator LED
resistor (220ohm) generates the same result. I even tried using the
(normally unused) basis of the optocoupler as input, hoping it was
more "sensitive" - but still only "humming"


The setup works when "piggybacking" a standard 3V LED (>10mA), where
the relay swithes fine. What have I overlooked ?


Any suggestions for (simple) curcuitry I could use to trigger the 5V
relay from the 1,5V 2 mA input (I only have 5V supply power
available) ?

.