I've been having problems with my laptop and I believe its a bad video card. I bought the laptop about a year ago and I've been using an external monitor via a docking station exclusively.

Model HP Pavilion dv6900
Card: NVIDIA® GeForce™ 8400M GS

I get a messed up view with multiple screen even in the BIOS which is leading me to believe its the video card.
Attached is the screen shot.

<a href="http://s28.photobucket.com/albums/c215/Zehrudin/?action=view&current=IMG00011-20090401-1821.jpg" target="_blank"><img src="http://i28.photobucket.com/albums/c215/Zehrudin/IMG00011-20090401-1821.jpg" border="0" alt="Bad Card"></a>

This is Integrated graphics card. If the card goes the whole Mother board has to be replaced. I guess if you have to send it away then that difference doesn't matter as much you will still me without the laptop for awhile.