Question Power supply issue...

Jun 8, 2019
11
0
10
I just got a rosewill 1200w psu and tried to put it in my hp z420 workstation to run my vega 56.... Why will it not turn on? I have a v2 series hp z420 with a xeon e5-2667 proc 64gb ram 1tb hdd and 250gb hdd please help.