My computer automatically turns off at times (read details)

[itsno]

I have this problem since 4-5 months. I was using the computer then, something happened when I restarted my computer, and it said that my bios was corrupted and it would boot from the recovery bios or something.
My specifications:
Gigabyte B75-3DH, bios version F10
Zotac GeForce GTX 650 Ti 1GB
Intel i3-3220
8(4*2)GB RAM
AOC 18.5 (768p)
Corsair VS450

My computer would turn off repeatedly. I would open anything, like Chrome, and sometime or the other, it would turn off all of a sudden, like the monitor would suddenly turn black and my computer would restart.

Though the automatic turning off was reduced when I plugged out my microphone and gamepad, I still have the problem. I put a 128GB SSD to see if anything turned well. Nothing happened.

I updated bios version to F15, no gain.
Yesterday I installed some new games. As I start one game and play it for 10-15 minutes, that one game and many others in the past, it turns off all of a sudden and restarts again.
So, in my opinion, I have traced the problem to be either with my graphics card, or motherboard, or my power supply.
How can I fix my problem?

 

[itsno]

You can fix this problem by changing your motherboard, i think it is not an issue of power supply or any other thing else.

I have faced same problem but when i replaced my motherboard PC started to work normally.

Even if I change my motherboard, my computer turns off while 10-15 minutes of gaming. So isn't that related to my graphics card?

 

[DarnitD]

You need to trouble shoot the problem..

Try clearing your cmos.
Try removing your graphics card and using the onboard graphics and play a not so demanding game and see if the problem persist. if it doesnt crash try using a different pci-e slot for your card.

Try using 1 stick of ram only and if it happens take it out and use another stick in a different slot if you only have 1 stick just change the slot.

but you might just be dealing with a motherboard that is longer able to function reliably in which case you will need a new one.
/edit
if you have tried another motherboard then it might not be your problem.

you could also try reinstalling windows.

 

[itsno]

You need to trouble shoot the problem..

Try clearing your cmos.
Try removing your graphics card and using the onboard graphics and play a not so demanding game and see if the problem persist.
Try using 1 stick of ram only and if it happens take it out and use another stick in a different slot if you only have 1 stick just change the slot.

but you might just be dealing with a motherboard that is longer able to function reliably in which case you will need a new one.

I can try that. But I cleared cmos once already and reinstalled os more than 6 times within 3 months
Thanks for the help though

 

[CBender]

I on the other hand think that this is psu related. Unfortunately both of these is kinda hard to test. If you can find a different power supply (borrow or something) and start there. If everything stands the same with a different then, probably, it is the mobo.

 

[itsno]

I on the other hand think that this is psu related. Unfortunately both of these is kinda hard to test. If you can find a different power supply (borrow or something) and start there. If everything stands the same with a different then, probably, it is the mobo.

Definitely going to try that. My system requires 400W but my psu is 450W so it isn't expected to be a problem, but will still try
Thanks for the help!

 

[CBender]

The thing is that the vs450 isn't the greatest psu around. Also that means that your operate at 90% which is quite high for a mediocre psu.