Black screen when playing certain game

VX35

Reputable
Mar 20, 2014
33
0
4,530
I have recently (3 months ago) built my first computer, and after fixing various problems, it's been running perfectly. I can browse the net and do just about anything without a problem. I've been playing league of legends (game) for 3 months now (on this computer) and nothings happened, I played 2 games (for about 1.5 hours) 5 hours ago with my computer running perfectly. Now with these last 3 games i have played, I was only playing for about 10 minutes before I got a black screen, I am not able to do ANYTHING, I can still hear the sounds from the game though.
I have a nzxt guardian RB, i placed my little temperature probs on the heatsink of the cpu, under the main HDD and 1 hanging freely in the case. Temperatures as of now are same as usual, they are, CPU: 28 degrees C HDD: 32degrees C SYS 25degrees C

Pc specs are:
MOBO: gigabyte b85m d3h
CPU: i5 4660
GPU: nvida gtx 650
RAM: 8 gb ram
PSU: corsair cx600

EDIT: I HAVE NOT TRIED ANY OTHER GAME. WILL TRY TOMORROW. REVISING FOR SAC .

UPDATE: GAME WORKS FINE WHEN USING ON BOARD CPU GRAPHICS (VGA).
DOESN'T WORK WITH GPU HDMI GRAPHICS