sometimes when changing a cable the system needs to be reset in order for the tv to recognise the PS3, if you hold the PS3 power button down for around 5 seconds when the blue screen is on (can appear as a black screen depending on the tv) it will restart the system and the picture will appear. this will also work if for example you have sky tv via hdmi and want to play your playstation through the same port if you only have 1 port on your tv, once you change the wires more often than not your playstation wont pick up, in which case the 5 second reset will work.
Bought this lead for my son's PS3. Inserted the lead ends in to the TV & PS3. Hey Presto! nothing but blue screen. Thought what I had done wrong, nothing. The hdmi lead connectors were slack when located in the connections. Tried a spare 'normal' hdmi lead I had. Worked perfect. Removed it & compared it to the PS3 lead and found the connections were about 3mm longer. The reason the PS3 lead did not connect properly was due to the lead connectors being too short. Not worth returning, postage would cost more. Be warned. My spare lead was a Bandridge Valueline LVB4010 HDMI 1 metre cable @ £3.99. Works perfect.