Somewhat of a newbie question I guess, as it's been awhile (7 years) since I last built a PC for apologies in advance if this isn't the correct forum.

Do the new power supplies, such as the Antec listed in the subject line, have to be connected to the MB for them to demonstrate any power (e.g., to even have the fans spin)?

I'm getting parts in sporadically to build my PC and wanted to test the PS I just received before its too late to return. Shouldn't the fans at least come on without the PS being hooked up to anything (other than the 110 outlet obviously)?

I'm afraid I got one DOA...I get nothing from it, but then I thought maybe the new PSs require a complete connection to the MB before they come on.

Thanks in advance...