pc suddenly turn off

[GelzoneUNSAS]

i am a noob and i am not sure it is related to power supply or what...plz help

computer specs:
window 7 home premium 64bit
intel i3-4130 3.40GHz
Nvidia Geforce GT640
8GB RAM

as i remember the power supply is GTR type R 450W

 

[vesp3r]

overheating? you can install some temperature monitoring software and see if it builds up heat, check if fan is working.
btw does it turn off when you do something specific or it does it even when you dont have anything started? It might be caused by some software