What video settings will I need to change on my mid-2009 Macbook Pro?

I am trying to send Audio/Video to my mother's T.V. using a third party combo cable(item # 6331), from monoprice.com. We have a 'Mid-2009 Macbook Pro. I can get the Audio with no problems. I tried all of the different resolutions on the Macbook and the closese Video image I can fet is a vertical sliver in the upper left hand corner of the T.V.(52'' Sony Bravia Model # unknown, mounted on wall) Please help. Mothers Day is coming up an All My Childeren is coming back, but will be on Hulu. Thank You