Sony Bravia NX713 and Sky 3D not working

[HELEN64]

Help !!!  We have bought a Sony Bravia NX713 and have Sky HD ,have had the 3d channel activated by Sky. All cables are in the right places on the Tv,Sky HD box and Blu Ray Dvd recorder. When we click on 3D and highlight 3D display all we get is  the option  OFF or SIMULATED 3D so are not able to change it to watch the Sky channel 217 which is shown side by side . We was advised by Sony to do a firmware update and this has made no difference. Anyone had the same problem?

[dikwad]

This has taken me hours and hours

Sony kdl 40 hx 803

Couldnt find a solution in anything suggested.

I did experiemnt a little with the sony menu and it has eventually worked.

Home Button Sony remote

settings menu

display

3d settings

(auto 3d was "on")

Turned this off and went back  to see if I could get 3d options - it didnt work

Went back again and turned it on - this did it when i went to the sony 3 d menus.

The other thing that I did prior to this working and not sure if this has anything to do with it was...under

"extrenal inputs" on the sony home menu, i went to HDMI 1 (which is where my sky is connected ) and pressed select on the blue sign, with arrow, 

that was it - 3d option back on from simulated