Your new HD TV is on a TV wall mount and the default picture settings are not right. The colour and contrast are too high because this is what makes the picture stand out in the shop. It’s time to get tweaking.
You will actually need different settings for films, games and for watching sport. You can save them separately and then flick between them according to what you’re doing. A good television will allow you to do this. If you’ve got an HD TV you will also notice quite a big difference once your TV is calibrated.