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That is one of the models that has passive fans below 65c. Try checking your temps in game, and the fans eventually spin up.
On the side of your psu, how many amps on the 12v rail?
You could try downloading "msi afterburner" and setting your fans manually to 70% and see if the issue goes away.
And about my PSU, i am not that technical about the amps on the 12v rail.
This is what it says on my PSU.
Output Specification:
Output Voltage 3.3V 5V 12V1 12V2 12V3 12V4 -12V 5Vsb
Current 33A 24A 13A 18A 16A 8A 0.5A 2.0A
+3.V & +5V Combined Load 170W
+12V1 & +12V2 & +12V3 & +12V4 Combined Load 464W
The lastest quality psu's have a single 12v rail. So there is no issue with one of the rails not providing enough watts. If you have any other pcie cables spare you could try those in the hope they use a different rail. But if it is the psu it could be a bit risky. Suggest you try another psu.
The PC shouldn't start if the PSU doesn't supply enough power. To me it sounds like an overheating problem, and if he suspects his GPU fans don't start or work properly that might be just it.
He said his PC does shut down as soon as the GPU actually needs to use all its fancy graphics. That doesn't sound like a PSU problem, but it sounds like something is amiss with the graphic card. Either it has some faulty chips or it overheats when it needs to use all its power.
Bring it to your local PC store. Not some brand chain, but some store you can trust. Ask them how much money it would cost to look into the issue. Usually the small stores will give a discount to the actual new card, if you need one. They will be able to tell you for certain if its PSU or Graphic card.
Nothing worse than buying a new expensive Graphic Card and then finding out it was the PSU that had some issue. Or your RAM was the culprit.
That sounds exactly power suply issue; as soon as graphics card starts to really draw power psu shuts down to prevent damage (graphics cards use quite little power while iddle). Most likely both power connectors are from same rail that can't deliver all the required power in full load situation. If it was only faulty graphics card whole computer would most likely not shut down (unless faulty card causes massive load that psu can't handle) Getting power from different rails should help or just play safe with new psu.
Not likely he would need to buy new card as gtx 970 should still have waranty. RAM seems unlikely issue if pc worked fine with old GTX 660. PSU doesn't even need to have any issues to be the one causing trouble. With multiple 12V rails with quite low power output each it only needs to be gtx 970 taking all from single rail. Could have worked fine with same rail and gtx 660 as it's maximum power usage is bit lower.
Gtx 970 doesn't take too much more power than gtx 660 and if you use vsync to limit fps on older games 970 won't go under full load on those (and doesn't draw as much power) and only draws full power in this more demanding game. Could still be faulty card but seems quite unlikely as you can play some not as demanding games.
Quite weird if card is faulty as he says he can play some games,possible but unlikely i would say. Might be worth trying running the game with low resolution with same efects and vsync on to limit gpu usage % (and power consumption) if it works then it's quite safe to say it's psu issue and not graphics card (unless vrm's are the issue) or corrupt game instalation.
edit.
Might be worth trying reinstalling graphics driver too as it seems quite common cause of trouble even though i did not see total shut down mentioned in those.
I looked around for a new PSU and i found the Seasonic Platinum Series 660W. PSU's is the one thing i don't know a lot about. But this one seems good.
Seasonics are quality stuff in general; just look that it has single 12v rail with enough A (and cabels needed even that should not be problem in the case)
edit. seems it has 55A 12v rail (if i found one you were referring to) that should do splenditly.
Depends on type of PSU too and amount of over draw. Many times PSU overheats bit and safety shuts down (if not some total crap that will just go on until it burns) and just starts back up. I wasn't speaking of over draw due pc falure but pc failure due over draw making psu buckle.