Powerstrip will only solve a little of the overscan problem that is causing the cropping of your picture. It may be that nVidia has some software simular to the ATI software that creates a resolution within a resolution to solve the cropping.
The better solution is to try and get into the service menus of your TV and set the height and width to eliminate the overscan for the input you are using for your computer. Be sure to write down the parameter and the factory setting if you try this so as to be able to get back to the original values. I don't know where to send you for the service menu codes. You may be able to google for them.