Computer shutdown when I play BF4

[NumBezZeDz]

There are lots of problems with my system.... When I play fullscreen mode, the pc just shut himself down for no reason at all. I fixed that problem by putting all my games to windows mode. But now... when I try to play BF4, the game loads but it cover only 1/4 of the screen, EVERYTIME when I try to maximize the window the computer shutdown.... To be specific, the computer cuts off it's power. I know that because my PSU take a few minutes to warm up and everytime this happens of me, I can't boot up for a few minutes..... But my PSU is more than enough to run my system without any problem.
Specs:
GPU: Hd 7990
CPU: i7 4770k
PSU: 1200W xilence
RAM: 16gb corsair vengeance pro 1866mhz
1 optical drive
1 ssd
1 hdd
and a Water 3.0 Pro from thermaltake
I checked the CPU temperature(50-60C), CPU voltage (@around 1.25), GPU temp (60-70) and even tried to overclock the CPU. Nothing worked. Please help!

 

[Dipan Saha]

Try installing the newer graphics card driver. Here's the link: http://support.amd.com/en-us/download
If that doesn't work, then try lowering the game's graphics settings.
If even THAT does not work, then reinstall the game. The game is a bit buggy, to be honest.
If NEITHER of the above solutions work, you may have a problem with your PSU.

 

[namhhgames]

Get another PSU to check if it's your PSU

 

[NumBezZeDz]

I would be monitoring your Temps and voltage... When I say voltage I am interested in the 12 volt and 5 volt numbers... and what do you mean by " my PSU take a few minutes to warm up " this does not sound good.

IKR xD it's so weird. Every time I turn the PSU on, the lightings on my mouse just start blinking.

 

[NumBezZeDz]

Get another PSU to check if it's your PSU

I have a 600W, Afraid it's not enough for my system tho

 

[NumBezZeDz]

Try installing the newer graphics card driver. Here's the link: http://support.amd.com/en-us/download
If that doesn't work, then try lowering the game's graphics settings.
If even THAT does not work, then reinstall the game. The game is a bit buggy, to be honest.
If NEITHER of the above solutions work, you may have a problem with your PSU.

Well thanks for helping... none of em worked and I always suspected on my PSU....

 

[GmanBOSS]

If the whole pc shuts off completely it is usually the psu and in some cases temps. Whether it be cpu or mobo temps.