I have had my sky+ hd box and my ps3 connected via a hdmi switcher to my tv for over a year with no problems. Now when selecting sky i get an hdcp error and no picture is displayed when i select the ps3 nothing at all, the tv says 1080i in the top corner but that is it

I have tryed connecting each item directly to the hdmi port of the tv and still the same result

Any answers would be greatly appreciated