I am having no problems until I hookup the GPU. I know this because my first rig is attached to a tv so I use the HDMI through the GPU but my second rig is attached to a VGA monitor. I don't have the ability to hook it up through the GPU because I do not have a compatible display.
Personally I would recommend not using integrated graphics. Running a screen off one of your graphics cards will give a 5-10% reduction in hash rate while the screen is on, but the overhead of trying to get integrated graphics working with nvidia drivers for overclocking is really more trouble than its worth.