I am well aware it is a bit late now, but I was recommended to use an application freeware called "HdmiOn". Google will find it for you. I downloaded it but not used yet as I switched to VGA instead HDMI as soon as I realised what is happening.

The recommended way to use it is to assign a button on the remote control to launch it, as there is no control through the screen until the connection is reset.

Maybe someone will use it...

I am pretty confident it can be done, as I just managed to switch the pc off using the Hauppauge remote control supplied with Nova-T 500 HD (black remote control). There is a freeware application called "poweroff". I modified the irremote.ini accordingly, and it works! Now I have to find a way to turn it back on (using the remote). This I am sure it is not so easy anymore... and further study will be required... playing with the S3 state prooved to be no easy task...