Black Screen error

I recently upgraded to a new desktop PC I built (Specs listed below). I reformatted my HDD, reinstalled Windows 7 Ultimate 64 bit, and FFXIV on it.
Now when I play I will run around for 10-15 minutes in game and then my screen will blink, kind of like turning my monitor on and off except the monitor never actually goes off.
After the blink my screen will be black, I can still hear all of the game sounds and even control my character but I can not see anything. I usually play in windowed mode with two monitors running, one for work/school and one for FFXIV. The error happens whether the second monitor is on or off. Also turning down the settings does not seem to fix the error so far.
Any help would be much appreciated and thankyou in advance ^^

Intel i5-3570k
NVIDIA GTX 670 - latest drivers installed as of 2 days ago
Biostar MB TZ77B - latest bios also
Western Digital 500GB HDD 7200 RPM (the only old part I still use from previous PC)
Corsair 770 watt PSU
and 8 GB of G. Skill PC 2400 RAM