Try going into the Setup Menu of the game console (via HDMI-3) and changing the resolution. There should be a compatible resolution that may work with the other HDMI ports. Why that's the case, I can't explain, but if the HDMI ports work for other HDMI sources except the console, it may be a resolution issue.
Are you getting "Mode Not Supported" or any similar error on the screen of the television?
Keep me posted.
So I have the Series 450 (32 inch) LCD TV and it has been working perfectly until yesterday. A friend of my daughter plugged in a PS2 into the TV (I wasn't there when he did it) and played it fine. Then they disconnected it and when I turned on my TV this morning it didn't work at all. The HDMI was plugged into slot 1, so I tried it in both Slots 1 and 2 on the back of the TV with no success. I then plugged it into Slot 3 on the side of the TV and it works fine that way. It is terribly inconvenient to have it on the side because the cord is not long enough and now I have to buy a new, longer HDMI cord for it to reach. What bugs me is that neither HDMI 1 or HDMI 2 function at all. Is there something I am missing in the setup? I went into the menu and couldn't figure out anything there.