PC crashing

I just got a new PC with these specs:
Intel core i3 3.1GHz
4gb ram
500 gb hdd
Nvidia Geforce GT 610
400 watt PSU

Most of the time when I play PC games ,my pc crashes and my moniter turns black,only way for me to fix it ,is to restart my pc.
If anyone here knows how to fix this,please reply
 
I just got a new PC with these specs:
Intel core i3 3.1GHz
4gb ram
500 gb hdd
Nvidia Geforce GT 610
400 watt PSU

Most of the time when I play PC games ,my pc crashes and my moniter turns black,only way for me to fix it ,is to restart my pc.
If anyone here knows how to fix this,please reply

Is this a retail pc you just bought brand new? Or is it one you got off someone that is new to you? If its brand new it should be under warranty. If so it would be best in most case to contact the retailer.
 
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