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HDMI does not work on this screen. It may be because the screen doesnt support HDCP or it is not ready. Please turn on the screen swithch to HDMI channel and try again.
which TV or monitor are you trying to use (brand and model)?
Multiple
1- Sony BRAVIA 32 inches HD LCD KLV-32BX350
2- LG 22LS3300 LED 22 inches HD
3-SHARP LC-32LE341M LED
The error message is with all of the above.
As the problem occurs with several TV's the problem is most likely in your phone or cable.
Have you tried updating the phone (http://www.sonymobile.com/global-en/software/phones/xperia-s/) and could you try another HDMI-cable?