Computer shutting off randomly, Any other culprits then the GPU and PSU?

[Adrian_121]

So about a month ago my PC was shutting off randomly, eventually we determined something overheating, and lo and behold a technician found that the Fans in the GPU had died. So with no other options and the warranty lost to time, I've had a fan hooked up to the open case since then. Fast forward to last week, and it started crashing again. We suspect the power supply, however the motherboard doesn't monitor regular statistics, and we've gotten some advice that it's not the power supply,
But its still crashing?
Are there any other parts to check in a situation like this?

GPU : NVIDIA GTX 970
PSU : Generic 600w
Processor : Intel i5 3470 3.20 ghz
Motherboard : kind of non descript

Wondering if I should try and replace the power supply anyways, or if I should just build something new.
Any help would be appreciated
Thank you!

 

[RememberThe5th]

Never use lemon PSU's you can always buy cheap evga bronze or similar from seasonic, always from known brands!!! I can guess that your psu is taking your whole rig down or motherboard is dying, if your technician didnt use Digital meter to see voltage on load then he might not know what he is doing, you can buy cheap replacment from ebay for GTX 970 since its 1 generation old or 2.