PSU with no power switch

[Nick goodwin]

I recently purchased a EVGA 400w power supply and I am having difficulty testing the computer without the power switch on the PSU.
Why doesn’t my PSU have a switch or how can I test this

 

[Cycloid Torus]

https://www.evga.com/support/faq/afmviewfaq.aspx?faqid=59582 should provide the information you are looking for.