take out the video card without a bios update some 670/680 cards can hang the mb without a bios update. if the system still wont power on. check that you have the 4/8 pin atx power connected on the side of the mb. if you do try powering the mb up outside the case. you may be shorting out the mb. if the board wont post outside the case. try using the usb flashback and put the 1606 bios on the mb. you dont need ram or a working cpu to do it.