I've noticed you sometimes have to "initialize" the LED, before you actually can change the behavior.
try adding
echo default-on > /sys/class/leds/xxxxxx/trigger
echo none > /sys/class/leds/xxxxxx/trigger
before the sleep 3 line, in the local start up script.
xxxxxx - the path is device specific, you have to look it up yourself.
you can obviously try the echo manually through ssh, before adding it to the start up script.