HDMI inputs not recognising devices

[jogrego4825]

My KDL-32s5500 does not recognise devices plugged in the HDMI sockets. I have tried several cables. I there a special cable required.

I can switch manually to the desired input with good results but when I scan for HDMI connections it still reports no devices.

Can anyone help as this is becomming a bit of a pain to have switch to my Humax PVR manually.