Monitor shuts off display/PC crashes

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I've been having a problem over the last week where my monitor randomly shuts off and PC becomes unresponsive. If I was doing something with sound beforehand (e.g. watching a movie) the sound will start looping after a few seconds as if the PC is crashing. I can not restore the session without powering off my PC and restarting it (even the reset button doesn't work).

Previously, I had gotten an error "Display driver nvlddmkm stopped responding" in my event log, now after downgrading my graphics drivers I am not getting the log message but the same problem persists.

Looking at my CPU, GPU and mainboard temperatures, they're fine. My main concern is that my PSU's 12V rail drops to 11.1-11.2 V occasionally (not often and only for a few seconds), I know that's too low, but I'm not sure if it's okay for it to dip that low for a second once in a while. On average it's above 11.5 V.

I'm going to run memtest86 in a minute, I'm guessing it's either the GPU or PSU causing the problem. I have another GPU I can use to test, but it uses much less power than my current one... so if the PSU is the problem, could that mask the problem?

Any other ideas?

Thanks
My Specs:
Windows 10 64-bit
AMD FX-7350
16GB DDR3
Asus M5A97 LE R2
NVIDIA GeForce GTV 760 2048MB (EVGA)
Corsair 600W Bronze PSU


This problem occurs more often when I'm doing something, but can also happen when PC is idle.

Idle temperatures:
15-20 celcius - CPU
35 celcius - Mainboard
35 celcius - GPU