Using Element 31" LCD TV as display

I have a 2008 macbookpro15 with the big video output plug on the upper right side as you face the computer. In the past I have used it successfully with my 2008 vintage 46" samsung to display photos stored in iphoto. (mac output to HDMI input). now with this new TV I get the MAC screen turning opaque gray blue, a line scrolling up the screen and then a message in 5 languages saying I have to restart.meanwhile the TV screen says "no input". when I push the power button it will not restart and the only option is to hold the power button down for a minute and then it shuts off. everything else (DISH DVR & Panasonic blue ray) works with either HDMI inpute just fine. Don't suggest I go to preferences because once it's hooked up, it's locked up in the warning message mode. thanks.