Just me or the PSU?

Novoj

Honorable
Apr 2, 2015
17
0
10,510
So I built my gaming PC early January this year and I bought the corsair CX750m PSU since I felt it would be enough for what I built. I want to say about after 4 months it died on me completely so I sent it in to get a replacement and corsair sent me back 2 of the same PSU's. Now today one of the replacements just went out again but I did the paperclip test and the fan still ran unlike the last one. I was curious and tried it on the second replacement and the fan ran at the same speed which is what i was testing for, which it did, and put it inside my tower to see if it could power it up which it also did which is how I am on right now. So for some reason the computer wouldnt start with the other one although it still passed the paperclip test. Can someone tell me if I need a better PSU or is it just me getting unlucky?

My specs are:
Intel i7-2700K
8GB RAM
2TB HDD
Corsair CX750M PSU
AMD Radeon HD 7870
AsRock Z75Pro3 Motherboard