Screen flashes black then back to normal during games.

[sayzor]

I recently had a friend put together a computer for me. I play League of Legends a lot and today i had some issues. Everything was completely fine and normal... then out of no where the screen would freeze, then go black, then just be normal again. It froze, went black, then back to normal with in 3 seconds. Its pretty annoying and gets me killed. It happened one or two times per game (about 30 minutes). Any idea what this could be? Here is what i know what put into the computer, if it helps at all. Thank you for your time.

Processor: AMD FX-6300 Vishera 3.5GHz (4.1GHz Turbo) Socket AM3+ 95W Six-Core Desktop Processor,
Link: (http://www.newegg.com/Product/Product.aspx?Item=N82E16819113286)

Motherboard: ASUS M5A97 R2.0 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS.
Link: (http://www.newegg.com/Product/Product.aspx?Item=N82E16813131873)

PSU: SeaSonic S12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply
Link: http://www.newegg.com/Product/Product.aspx?Item=N82E16819113286

Graphics Card: XFX Radeon HD 6670 pci 2.1 BUS. 1 gig of vram.

Screen: Viewsonic VA2212m-LED
Link: http://www.viewsonic.com/us/monitors/va2212m-led.html

4 gigs of Ram

1 terabyte Western Digital HDD

 

[Rockcox]

hi, make sure that all your drivers are up to date specially from your video card.

PS: I had a problem some time ago that it seemed to be my video card (the screen went black now and then) and the final solution was to change my hdmi cable.