try one stick of ram. if the mb cant set the ram speed right it goes into a reboot loop. if it does it with one stick of ram see if yuo can get another stick of ram from another vendor..check to see that the ram you have is on the mb qal list or the vendor tested the ram in your mb. on your mb check that the aux power is connected on some mb it a 4 pin plug on others it an 8 pin. aos check that if your video card has two 6 or two 8 pin power there both plugged in. the other oppsie...check to see if you plugged in the reset button to the reset header. if not you could be shorting the mb out and locking it into reset mode.