I have just installed a new MSI motherboard with an AMD A4 5300 cpu with integrated Radeon HD 7480d graphics. I also have in my old ATI Radeon x300 card. I installed all the drivers etc and device manager shows the 7480 as working. I have variously disabled or uninstalled the x300. When I plug my monitor into the HDMI slot via a DVI-D adapter, nothing, blank screen. This is using Vista 32 bit. What am I dong wrong?