Games crashing

[IamCathal]

So, recently whenever I start up games (any games such as BF4, Shadow of Mordor, Garry's Mod) the game just stops and freezes my computer. I'm forced to turn off the pc from the power supply. Here's my rig:

 

Intel core i5-4690k

Gigabyte GTX 970

Asus Maximus VII Ranger

8gb Corsair Vengeance Pro 1866Mhz

8gb Gskill Ares 1866mhz

Antec 620W PSU

1TB WD Green 

 

Keep in mind I'm getting no error codes on my motherboard