I am having the same problem here.
I cannot get video signal with the 15″ commercial LED monitor (HDMI input) but when I tried it out with a full HD monitor 9″ using the same 576i output source it works.
I’ve read in some of the forums here that this could be due to HDCP compliant issue. I’ve just tried out the Gefen HDMI Detective Plus and it still doesn’t work.
Advice anyone?