Hi. Any Help please. I bought brand new motherboard from closing down shop (Model: ASUS M4A78T-E) I think I may have a defective motherboard. I have been unable all weekend to get the system stable. Everytime I install the drivers for my gfx card (ATI 4850) the system will not boot up. I also noticed when fitting the board that the northbridge heatsink was not on securely and was rocking. Any support or advice please. Thanks in advance. Regards. Jury