LCD TV not too hot with computer hook up

I hooked up my laptop to my LCD tv using a DVI to HDMI connection which should have produced a nice picture. It didn't. The text was not readable at all. Half of each letter was missing and the entire image was stretched out beyond the frame of the TV. Something's not right with the TV. I need to get some tech support or take it back. It looks good on some channels, terrible on others and unbelievably bad with the computer. I haven't tried a DVD yet.