This one has been asked before and it's not a feature when we connect with HDMI.
Please call it in and complain and if they still say no, consider the fix.
I have a 40" LED TV that works great. My only problem is that if an HDMI source goes offline the TV does not get in stand by. If I connect Through VGA it goes just fine.
Is there a way to configure that so that the TV goes in standby the way it does on VGA?