So I fixed this problem...
the problem was that im an idiot (still an existing problem).
Initially when I got the psu I cut the 5v and ground off a molex. I soldered them up to a power end that would plug in the arduino. I didnt think anything of it.
The problem was that when I used my heatshrink to cover the cables the damn 5v wire was touching the ground which essentially shorted the psu.
So after buying a crapload of resistors, trying every different combo, soldering all the 24pin power connections with female sockets to easily swap out resistors. I took off the heatshrink on my arduino power connector, separated the cables and boom psu turned on no problem... even powered my arduino which was the goal.
now gonna finish this thing
Thanks everyone who provided input on how to solve, even though I had a dumb issue I learned a lot more about psu's than I knew before.
**im pretty sure this is the programming equivalent to spending hours debugging code only to find out you forgot a comma.