tonight i built a sn27p2 the specs are amd x2 5200+, 120gb non sata hard drive with windows xp installed (pretty old), 1gb corsair corsair xms2 ddr2 800, and a sapphire x1900gt. i think the problem is the graphics card, i accidentally ordered two of them and tried both and i get a no signal from my monitor when i turn it on. anyone know whats wrong?