I have an asrock p43twins1600 mobo with an intel e6550 cpu, 3gb 800mhz ddr2 ram,120gb sata hdd,chiefmax 550 watt psu,windows 7 ultimate os. I added an evga GeForce gtx 560 se video card but the system didn't acknowledge it. I previously had a GeForce 9500gt and didn't have any problems. any solutions? thanks!