Computer freez after 3 minutes from start up

Hi guys I'm new to this and need some guidance. I assembled a new gaming pc which was working fine until two days ago, where it started to freez 3 minutes after starting. It happens whether Im watching a video or playing game. I started in safe mode and it ran normally. The only new addition in terms of software were three games via steam. I doubt its hardware coz bought everything new.

Specs:
Windows 8
Mushkin 32 gb sdram
Intel i7 4790k
Geforce gtx 970
Corsair H110 CPU cooler
Asus z97 motherboard
Mushkin ssd sataiii 1tb
 
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