Computer freezes while playing games

Derrek321

Honorable
Jul 15, 2013
2
0
10,510
i built this computer myself it was my first one so i'm assuming I did something wrong. I've had it for a while and ever since i've had it it will frequently freeze while playing games. no artifacting, audio loops, etc. the screen just keeps the same picture it froze on and no key inputs work the only thing that will work is a system reboot. PLEASE HELP. here are my specs

CASE: APEVIA X-TROOPER Series X-TRP-GN Black / Green Steel ATX Mid Tower Computer Case
PSU:Apevia Aqua ATX-AQ700W-BK Power supply - 700 Watt
MOBO:ASUS M5A88-V EVO AM3+ AMD 880G HDMI SATA 6Gb/s USB 3.0 ATX AMD Motherboard
CPU:AMD FX-4100 Zambezi 3.6GHz (3.8GHz Turbo) Socket AM3+ 95W Quad-Core Desktop Processor FD4100WMGUSBX
GPU:Sapphire - 100314-3L - HD 6870 Pcie 1GB DDR5 DL-DVI-I
MEMORY:CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 Desktop Memory Model CMZ8GX3M2A2133C11R

I have the side of my case opened with a fan pointed it. it still crashes with the fan pointed in but it takes much longer to go down. Without the fan i could start up a game and it would freeze within 5 minutes but with the fan it lasts 30 minutes to sometimes hours with out freezing. Some one please help me.