Hello just built a new system. Seems the graphics card, Sapphire R9 270x dual-x 2GB, isn't working and causes the computer to get stuck in a boot loop, try to boot, restart...I've read a few posts on this issue to check motherboard setting for pci express when I get home I'm gonna take a look. The onboard intel hd, hdmi, works just fine. I've already checked the psu cables and power, it's 750 W. Mobo is Gigabyte G1.Sniper Z97.