HDMI doesn't have anything to do with your problem. HDMI is the cable that people use for Higher Defenition TVs. Make sure that after you have correctly connected the PS3 to the TV, to change the input, some TV you will have to put them into an specific channel, if it doesn't have an imput selection. In some TV is channel 3, 8, 1 just go trough all of the channels until' you see the PS3 Screen