random restart of pc

[Guest]

i have a problem.. whenever i start a game.. my computer is restarting randomly.. cant detect what is the problem.. o even changed processor jelly..if it was over heating or something. Still its restarting. Please help.... urgent

 

[J_E_D_70]

Monitor the CPU and GPU temps. Also, how old is the power supply, is it a good brand, and is it strong enough for the GPU? How old is the GPU?

 

[Biswarup Das]

my power 450w supply.. GPU is 9600GT 3and half years old... and cpu temp is around 45-50, it only restarts when i m starting a game

 

[J_E_D_70]

Know anyone with a spare psu or a comparable gpu u can borrow to test with?