When you install the GPU,this process happens automatically.Though,if it doesn't you need to goto the BIOS,look for the option,Primary video adapter and select the PCI-E as the primary adapter,to which you'll have to connect the monitor thereafter.
When you install the GPU,this process happens automatically.Though,if it doesn't you need to goto the BIOS,look for the option,Primary video adapter and select the PCI-E as the primary adapter,to which you'll have to connect the monitor thereafter.
If I understand you have an 8800gts installed on a MB with an Intel CPU that has integrated graphics. If that is true, then go into your bios and select it as the default or preferred (same thing) video device. That will do it for you. Remember to attach the monitor to the video card not the MB video.