The only work around I have is to use a a DVI to HDMi adaptor and take the signal from DVI to the TV.
This is super lame as it restricts me to a max resolution of 1080p, but at least I have an signal.
Interestingly the DVI to HDMI setup results in a "No Signal" condition for POST. Once POST is complete and the windows boot starts the signal is found.
Not impressed with the lack of official response on this.