Random game crashes? HELP

[Imbue]

Hi Everyone!

 

I recently built my first pc and over the past month I’ve been experiencing crashes when loading up games like CSGO and COD. I ran some benchmarks and realized I needed a bigger psu which I assumed was the problem. I originally had a Corsair rm750 but replaced it with an Asus Thor 1200w platinum yada yada. Still experienced the crashes, so I ran a benchmark using user bench and it didn’t detect my gpu at all. So I went out and bought a brand new 4070 ti which after installing and running a few test games, still experienced the crash! I then assumed it was my ram sticks because I had also recieved a memory management bsod every now and then and ran memtest86 a few times which my ram sticks passed with flying colors. I did have white cable extenders which I thought might not have been rated for high voltage or something so I removed those and am still now dealing with the crashes. 
 

NOTE; I had a corrupted OS that had been fixed could that be the issue? And if so how would I fix it?