I just got my GTX970FTW (with the ACX 2.0 fan system) and updated all the drivers and, using the GeForce Experience, optimized my game settings. I was trying to join a game of Battlefield 4 and as I spawned in my system just shut off. It turned itself back on a few seconds later and booted normally. I recalled having a similar issue years ago with a different video card and that was definitely a weak power supply. Today I'm using a 750W PSU and after looking at the specs for the card and my computer over all it should be more than enough. So I'm wondering if the fans on the video card didn't kick in and so it overheated causing the system to shut down to save the day since they say that they "will not turn on until they are needed to cool the card." I don't know if they even kicked in before the system shut down. Anyone got an idea as to what my problem may be??
 
Update: I downloaded and installed the PrecisionX software and set the thing so the fans are running, keeping the GPU cool like they should be. When that didn't solve my problem I tried reverting to the previous in-game settings and this time when I loaded into a game the system didn't shut down. That gives me the feeling that my PSU is not good enough to run the card with all the video settings running at the max the GeForce Experience says it can. Does anyone agree with this assessment? I was so certain that my 750W PSU was enough but now I doubt.

darkon00
I just got my GTX970FTW (with the ACX 2.0 fan system) and updated all the drivers and, using the GeForce Experience, optimized my game settings. I was trying to join a game of Battlefield 4 and as I spawned in my system just shut off. It turned itself back on a few seconds later and booted normally. I recalled having a similar issue years ago with a different video card and that was definitely a weak power supply. Today I'm using a 750W PSU and after looking at the specs for the card and my computer over all it should be more than enough. So I'm wondering if the fans on the video card didn't kick in and so it overheated causing the system to shut down to save the day since they say that they "will not turn on until they are needed to cool the card." I don't know if they even kicked in before the system shut down. Anyone got an idea as to what my problem may be??
 
Update: I downloaded and installed the PrecisionX software and set the thing so the fans are running, keeping the GPU cool like they should be. When that didn't solve my problem I tried reverting to the previous in-game settings and this time when I loaded into a game the system didn't shut down. That gives me the feeling that my PSU is not good enough to run the card with all the video settings running at the max the GeForce Experience says it can. Does anyone agree with this assessment? I was so certain that my 750W PSU was enough but now I doubt.

What is the make and model of the psu and how old is it? In fact what are the rest of your system specs and is your cpu overclocked? Many people have issues with installing the complete list of NVidia drivers instead of just the graphics driver and PhysX driver, especially with GeForce exp. Also, your driver install/uninstall procedure can contribute to issues too.

If the GPU overheats, normally the screen turns blank, the GPU fans spin up to ful speed, and the computer doesn't turn off/restart (computer stays "on").

Usually a restart is caused by either a bad power supply, an overheating CPU, or a Windows crash (memory issue or other hardware failure). What are the CPU core temperatures? What does the Windows event log say (Kernel-power or some other critical error message)?

ty_ger07
If the GPU overheats, normally the screen turns blank, the GPU fans spin up to ful speed, and the computer doesn't turn off/restart (computer stays "on").

Usually a restart is caused by either a bad power supply, an overheating CPU, or a Windows crash (memory issue or other hardware failure). What are the CPU core temperatures? What does the Windows event log say (Kernel-power or some other critical error message)?

When it did it the first time I looked into the event log and it said Kernel-power, Event ID 41. That's the event log entry for every attempt I made with the higher video settings. When I tried joining a game with the higher game settings the system power just died. It was like the power failed in the house but it was just the PC that went out. It also turned itself back on a few seconds later. That's why I'm thinking it's the PSU more than anything.
 
To answer a different question from a different post, my CPU is running at around 36C when idle. I don't think it ever got high enough to trigger a shutdown when in-game.

Update: I swapped out my PSU for a new 1200W bad boy and I then re-optimized the settings in BF4 and have successfully played a couple hours of the game with the new higher settings. I would say that my 750W for some reason or other just couldn't handle the GTX970 FTW. Thanks to all of you for your suggestions and help!