Do you have same problem with an earlier version of the graphics driver?
Did you probably try version 18.104.22.1689?
Have you loaded customized driver from Asus?
Are you using any video adapter? Like DVI to HDMI
I have tried both latest version from Intel web site (2509) and the ASUS drivers from the motherboard install DVD (2361).
There is no video adapter - it's motherboard DVI => TV DVI.
Sound comes from motherboard SPDIF to receiver SPDIF.