PSU weird power switch

bd08

Distinguished
Nov 12, 2011
2
0
18,510
Hello,
I've just recently built myself a new gaming computer from parts, and its great. However something surprised me the other day which I wondered whether someone could perhaps explain to me. I pushed the computer power button and the computer turned on normally. However when I finished using it I went to switch off the PSU switch at the back to turn it off, and found that it was already off. So how could my computer run with the PSU switch set to 0?
Anybody have any ideas? Is this normal? Does it show I have a fault with my PSU or build?

PS Its a Corsair HX850W