PC fully turn off while installing GPU driver

[azimDUSTY]

helo guys, i had a really weird problems here. yesterday, i try to upgrade my GPU driver. i'm using Radeon HD6670. while installing the driver, about 40-50%, my PC suddenly turned off itself. like i turn off the switch. no power at all. so i thought my GPU might had a problem. so i swap with my friends R9 280. but it still happens. is it because of PSU, GPU or APU?

this is my specs:
APU AMD A8-5600k BE
GPU R9 280x
RAM 8GB DDR3 Corsair
MOBO Asus a88xm-a
PSU Cooler Master Extreme 2 - 725W

 

[ZeusGamer]

I'm saying this based on the reviews from Newegg. I'm going to blame your PSU on this one. It could be the one giving you problems.