computer freezing problem

[rrod14]

My computer freezes after using it for a while. It happens while playing games and it also happens when I am just using the computer normally. The computer will start to lag and then the monitor turns black. The pc stays running but it doesn't show anything on the monitor. Once I restart the computer everything is fine again. All the parts in the pc are new because I built it myself a few months ago. I think it might be a problem with the motherboard but I'm not sure.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($229.98 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: ASRock Z87 Extreme4 ATX LGA1150 Motherboard ($151.98 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($82.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: EVGA GeForce GTX 770 2GB ACX Video Card ($249.99 @ NCIX US)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($44.99 @ Micro Center)
Power Supply: XFX 750W 80+ Bronze Certified ATX Power Supply ($79.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($90.26 @ OutletPC)
Total: $1032.12
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-13 17:32 EST-0500

 

[ganon11000]

Could you use hwmonitor to monitor temperatures of the PC?

 

[rrod14]

This is what I get with hwmonitor

 

[rrod14]

Any more help?

 

[ganon11000]

Have you got all the latest drivers and BIOS updates?