Weird problem. The only suggestion I have is to isolate the problem: is it the TV or the computer? Is it the video drivers or WoW?
For the first question, you'll need to try it out on a different TV. Worst case, take it to a retailer and say you want to buy a TV but you want to make sure it works with your laptop (or be honest, some ppl out there are still nice).
For the second, see if it happens in other games. I'd try this first, as it may save you the trouble of finding another TV. If it happens with all games, it's either the laptop or the TV so answer the first question now.
If it's not the TV, it's either the laptop hardware or the drivers. Chances are it's the drivers, so wipe them clean and reinstall.
That's the diagnostic method. You could just refresh the drivers right from the start, too. No guarantees it will help, though, unless you've already determined they are the problem.
If it's the laptop hardware, you're out of luck afaik.
Oh and check the cable too...