I have not used that particular cable. But make sure that the 720 and 1080 modes are turned on thru your xbox dashboard. If they are already your cable might be damaged.
If that does not work I would suggest getting the monster cable version. A little pricey, but it works great and is 10 feet long.
If that does not work I would suggest getting the monster cable version. A little pricey, but it works great and is 10 feet long.