hdmi output greyed out

Had same issue. Solution is not intuitive.

settings>general>tv and display settings>video fidelity and overscan>display overrides .. set to hdmi

reset resolution.

I just had the same problem. It was down to the tv output being set to dvi rather than hdmi. Dvi doesn't carry audio so would require an optical cable.

Go in to picture setup and change it from DVI to HDMI

Hope it works

the trouble shooting says if the "using HDMI or optical audio headset" is unchecked I can change the speaker audio but that didn't work.

its not the setup its the fact that on the xbox the HDMI audio output is greyed out and wont let me change it.

the speaker audio wont let me change it.

I went to settings then volume and audio output and the using hdmi or optical audio headset is unchecked and still greyed out