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Edited August 2, 201510 yr by AlconH

Maybe you are running too many things on it or try a diffrent power outlet maybe the one your PSU is connected to is faulty.

Could you post your specs and the three PSUs? Very odd problem indeed. 

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Edited August 2, 201510 yr by AlconH

your PSU is only an 600w,  I suggest that you don't buy an CX600. next time buy an different PSU with around 700w or 800w 

Edited February 1, 201412 yr by Empire

I feel as if 600W is more than capable, I was thinking if you had a 400W or something that would be the problem.

 

This might be a longshot, but based off of your symptoms of restarting, PC applications crashing, ect, it may not actually be your PSU after all. Perhaps it's faulty drivers, faulty RAM, or a GPU going bad. 

 

It's hard to tell with the such limited information, but 3 PSUs going bad is very unlikely, it just seems to me it might be something else in your system. 

What is the power draw of your computer at max draw?

I reckon its your GPU waving goodbye. The fact that your PC ran fine without it connected is making me quite suspicious of it.

 

There shouldn't be anything wrong with those Corsair PSUs, I'd also say that them being 600W units is likely to be more than sufficient for what you're running. I'd suggest you try both the PSU and GPU together in another PC to see whether or not the GPU is the cause(which it probably will turn out to be). Theres a decent PSU calculator available that you can use to calculate your max draw at different loads and take into consideration the factors such as PSU capacitor aging, you can find it here.

 

How old is your GPU and how often do you put it under stress?

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Edited August 2, 201510 yr by AlconH

Alright, what you could try before replacing the PSU (Because that may not be the problem) Is to disconnect your Graphics Card and then start playing some games. (It will use integrated graphics, at least on Intel I'm not too sure if AMD has that stuff).

 

In other words, just disconnect your GPU and did what you did that caused problems. 

 

This way we can at least isolate whether or not the GPU is at fault.