Those of you that play on your HDTV

Using my hdtv as a monitor, i can play skyrim and a lot of other games fine but when it comes to battlefield 3 the mouse alignment is off. its only off on fullscreen mode, i have to set it to windowed mode and the alignment is fine.

it also occurs on a very few other games, any way i can fix this?

ive fiddled with overscan already. the picture is perfectly fit on my screen.

do i need to adjust it to fit off the screen or make it underscan more?

umm, i never noticed a problem with my mouse. i game on a 42 in and a 55 in plasma display. My hdmi is routed through my audio system to my tv. I never had to make any display adjustments.