Please bear in mind that this product has reached its End of Interactive Support so Intel no longer provides interactive support for this product via telephone, chat or e-mail. Furthermore, no new drivers and BIOS will be developed for this product.
Is the Radeon 5750 card working in another system? If its working, then try updating the firmware of the video card you have installed.
If the issue persists, this might be a compatibility problem between that card and the motherboard, so you should check with ATI* for another card that has been tested on these boards.