Another 8400M GS Driver help thread  

Okay, so I popped open my computer, everything was hooked up as it should be. I am so stumped, none of the drivers are working!
Thank you everyone for your assistance, anyone else have any ideas?

You can always give this a try,

NVIDIA Driver - Convert from Desktop to Mobile (Laptop)

And if that doesn't work and you haven't yet, do a search in the Graphics Cards forum,

Graphic Cards - Windows 7 Forums

using sony and 8400m as the search terms and see what has and hasn't worked for others.