|OK, I downloaded the manual & had a look at the BIOS section. You probably have these set correctly, but it won't hurt to double check.|
Under Advanced Chipset Features, set the 'Frame Buffer Size' to disabled. 'Bank Flip' & all Spread Spectrum options should also be disabled.
Under Integrated Peripherals, set 'Onboard GPU' to Auto.
Under PnP/PCI Configurations, set 'Init Display First' to PCIEx. Set 'Reset Configuration Data' to Enabled.
Save & Exit.