Originally Posted by femi
ok, how can i change xbmc to use my graphics card then?
I uninstalled the onboard GPU, seated the graphics card in the PCI-e slot, booted up, made sure in BIOS everything looked correct, including that it was going to use the new graphics card. Once booted up, installed the new drivers, etc... for the new card, plugged in the HDMI cable to the graphics card, not the previous HDMI port, and fired up XBMC.
I didn't have to change anything in XBMC to make it work. Once I did all that, and opened up XBMC, everything worked right away.
Hopefully that helps your situation. It did wonders for mine. Like I said, it may have been just my board, since I built the low end machine from renethx guide, but the XBMC folks said that what I had for onboard had known issues with VC-1.