start with the simple stuff. with just the onboard video make sure the mb bios is up to date there are a lot of updates for that mb. on that video card it looks from photos online that it has two 6 pin pci power plugs. make sure your using both. also check that you have the 4/8 pin connected on the mb and it seated. also check that your using the top video slot. if you are try using the lower slot and see if it works. as the onboard ipgp is working make sure you have the newest drivers for it and intel mb chipset drivers from intel.