Computer shutting off, with blinking power light

BobbyM747

Commendable
May 4, 2016
1
0
1,510
I've been having this problem for a while now, and really need help figuring out what is happening. When I try playing a game, like Battlefield 4 for example, about 10 minutes in, the whole PC will shut off, followed by a blinking LED light. In order to turn it back on, I have to unplug the PSU cable in the back, and flip the switch on the back. After a while, the problem stopped. Recently, trying to play World of Warcraft, it crashed while playing, five times in an hour. I have restarted my computer so many times in that hour. I have a 650w PSU (unsure of the brand, had it since 2012), Nvidia GeForce GTX 660 (SLI), Six Core Intel CPU. Windows 10 64bit.

I'd really like some help on this.