I'd assume the TV works/displays fine on it's own (i.e. can watch cable, etc.)? Just curious as you mentioned the green hue and that'd sound like more of an issue with light engine in the TV itself. Does seem odd that you're not getting any rings though. If the video chip had died, would think you'd get the RROD and from experience I know you'll get a couple lights if you don't have anything hooked up to the video-out so that would probably rule out it being a connector issue.