Computer Freezes after few minutes of Dota2

[benniboi]

I just built a new PC during Black Friday. It runs fine watching YouTube.
So, the PC crashes when I play dota 2 for a while. I haven't tested other games yet.
When it crash, the monitor loses singal, then:

• 
  ■ Dota 2 background music is still playing, ---music plays for a while---, and BZZZZZZZzzzzz~~~
  ■ music gets stuck (BZZZZZZZzzzzz)

My basic PC Specs are:

Spoiler

PSU: CoolerMaster Elite 550 ver.2
GPU: Asus Strix GTX970 (Idles at 30 C, when playing dota 2 about 40C)
MOBO: Asus z97 - a
CPU: i7 4790k

I am suspecting either GPU defect or PSU not giving enough power, is there anyway to test? What is the proper way to approaching this problem?

 

[dominicanfury]

the card might not be getting enough power. If you have modular power supply make sure your using the the PCI-E Section of the power supply. another thing you can do is check another PCI-Express lane if you have any available. if that dont work its a defect.

 

[benniboi]

the card might not be getting enough power. If you have modular power supply make sure your using the the PCI-E Section of the power supply. another thing you can do is check another PCI-Express lane if you have any available. if that dont work its a defect.

I don't think my PSU is modular...
What do you mean by "it" in "its a defect"? "it" as in the video card? Since my case is a bit small, I probably need to take the MOBO out to test it.