Which of my components is faulty? (GPU, PSU, Possibly Mobo?)

MeatSalad

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Apr 5, 2015
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Hi guys. I built my first PC about a month ago, and until yesterday, it's been running absolutely flawlessly. I haven't bothered with any overclocking yet. Before I continue, here's my build:

i5 4690k@3.5 ghz
8.00 GB (2x4) Kingston HyperX RAM@798.1 mhz
ASRock Z97 Extreme3
MSI GTX 970 Gaming
Corsair RM750w PSU

So yesterday, I decide to dick around in the UT4 demo. When jumping around the map with the translocator, my screen turns black, I hear an odd buzzing sound coming through my headphones, and then the system restarts. I was a bit anxious after this, my train of thought already assuming the worst. But I decided it was probably something to do with UT4 being pre-alpha and unstable and moved on to a different game. I fired up Far Cry 3, and within 15 minutes, I get the exact same crash again. This happens once more with the same game, and then I decided to update my mobo BIOS as well as the nvidia drivers to the latest version. I fired up MSI Kombustor after this to see if I could trigger the crash without playing a game, and sure enough, it crashes again. Except this time, I hear a static noise going through my headphones instead of a low buzzing noise, and the computer shuts down completely.

I had to reset the switch on the PSU to get it to start back up again, and when I did, all the case fans and LED's powered on, along with the GPU's LED. However, the CPU fan doesn't spin up, and I get no picture on my screen whatsoever. I didn't manage to get past this until I pulled out the GPU from the system completely and plugged the HDMI into the mobo. So now I'm here, at the point where I have no idea what part is at fault here. Another thing is that my wifi card (in a PCI slot) now only sporadically works, after restarting or shutting down manually.

My gut feeling is that my PSU wasn't supplying the proper power needed for the GPU (I've been hearing mixed things about the corsair RM series), which is why the crashes occurred in the first place. And if that's the case, then I'd assume the PSU just completely fried my GPU after so many consecutive crashes. The sudden wifi card problem makes me feel like a mobo issue is possible, and the crashes in general make me wonder if it's the GPU at fault on it's own and maybe the PSU is fine. I really have no idea and would greatly appreciate any help I can get.
 
Solution
Suggest leave the replacement PSU in for now while trying to get the system to work properly.

Monitor cable connected properly?

As suggested above, try (re)installing sound and video drivers in case there are driver conflicts or corruption.
Make sure video card and DIMM's are seated properly.

If problems persist, then remove video card and use integrated graphics, and/or try video card in another computer.

If problems persist, try one DIMM at a time and in different slots, and/or try DIMM's in another computer, and/or remove DIMM's and try other known working DIMM's instead.

If problems continue, try another PSU (borrow from friend, or neighbor etc if necessary).

If problems continue, then suspect motherboard may be faulty.
 

MeatSalad

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Apr 5, 2015
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4,510


I already tried taking the card out and using integrated graphics, as I said in my post. Just now, I tried sticking it into a different PCI slot and it managed to boot to desktop without a hitch. But then the absolute second I fired up a game, it did the same black screen crash and reboot that was happening to begin with. So now I'm back to square one again, but at least I have basic windows functionality while having the GPU in the computer, unlike before where I could only get it to boot without having it plugged into the mobo. Not sure where to go from here, but I will try fiddling with different RAM configurations to make sure RAM isn't the issue. I have another PSU I could try, but I'm not 100% it'll be adequate for my current build since it was from a build about 5 or 6 years old.
 
Also, could try -

Reinstalling sound (card) drivers. Corrupt or outdated sound drivers can cause all sorts of issues.

Try uninstalling video card drivers (again).

Boot into Safe Mode.

Run DDU (available here).

Remove all traces of nVidia drivers using DDU.

Reboot into Normal Mode.

Install latest video card drivers. And reboot when required.

If the above still doesn't fix the issue, then still suspect the motherboard and/or the PSU is/are faulty. That is why another PSU should be used to help determine whether the PSU or the motherboard is faulty.
 

MeatSalad

Reputable
Apr 5, 2015
8
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4,510
Tried different RAM configurations, including trying different RAM sticks that I know work instead, no difference there. I then tried an older PSU with the same wattage (corsair cs750m), and everything boots up, but im not getting any picture. Tried clearing the CMOS and triple checked all the wiring, nothing happened. Not sure if I should try putting the other PSU back in or keep trying to get an image with this one first.
 
Suggest leave the replacement PSU in for now while trying to get the system to work properly.

Monitor cable connected properly?

As suggested above, try (re)installing sound and video drivers in case there are driver conflicts or corruption.
 
Solution