i just build my computer and i have bin having problems. The computer screen freezes randomly I was wondering what might cause this i tries updating drivers, rolling them back, changing the operating system to be on the hard drive I am stumped at this point, also when the screen freezes, i have to reboot the computer also after the screen freezes the fans continue, specifcations is a i7-4771 prossesor, 16gb of ram, motherboard gigabyte H87-D3H, a Corsair AX1200 (1200 watt ),operating system is Windows 8.1 pro . any idea and how to fix. Thanks