HELP with booting please <3

[Sir0zero]

Hey! So I have a bit of an older setup which is:

 

4960x @ 4.5

p9x79 ws/ipmi

32gb ram @ 2300 (I think, I'll double check)

gtx1080 hybrid

Silent Pro M2 850W

 

The cpu, ram, and motherboard came from an old high frequency trading server. It was a good deal (I think 350 cad last year), and while I was expecting issues down the road I don't quite know whats causing it.

I can boot the computer, and it will very rarely give a bios code or display. Meanwhile, if I boot the computer and flick the power on the PSU on and off via the switch it will do a reboot and boot into windows fine. Its not the best solution so I was curious if you guys could help me out at all  

 

I tried using one stick of ram, using a different GPU, I went through OS reset (got a new SSD) , the one thing that I would like to test would be a different power supply but I'd like other peoples opinions before I buy a new one since I don't wanna waste 80 buckeroos on a psu thats just gonna sit around. Thanks ahead of time! 

 

I got reccomended to unplug the 6 pin plug to the GPU and then plug it back in and see if it works and, that works and will be fine until I do a complete shut down (turning off computer and then switching the psu off, unplugging it and holding the power button). Occasionally, the computer will also just randomly reboot and when it boots up its fine. I plan on selling some of these parts, so I also just wanna make sure I'm not selling faulty parts. Thanks for the help ahead of time