you need your graphics driver since its most likely is using the default windows vga driver. rightclick on my computer and hit mange, then click device manager and look for display adapter. it will most likely have a yellow exclamation point next to it as well as any other missing drivers. if you know what graphics card is in there go to the manufacturer website and download it or go into properties under the vga device and go to details then scroll to hardware details and copy the top line into google and you should find a driver if it is in fact missing. after you install he go into the resolution setting and hit detect display i believe and it should find the correct res settings