i just build my first PC it goes on but it also goes off
my pc
CPU: FX 8350
RAM:KINGSTON HYPERX 16
MB:ASUS CROSSHAIR V FORMULA -Z
GPU: POSEIDON GTX 780
SSD: 120GB
HD 2TB
PSU: EVGA 850 G2 80 PLUS GOLD
my pc
CPU: FX 8350
RAM:KINGSTON HYPERX 16
MB:ASUS CROSSHAIR V FORMULA -Z
GPU: POSEIDON GTX 780
SSD: 120GB
HD 2TB
PSU: EVGA 850 G2 80 PLUS GOLD