Is my new SeaSonic DOA or?

[davehries]

Hello,
I have just purchased a new SeaSonic SS 400W PSU. I installed it in my new computer case. I have not installed anything else, as I am going to move my old MoBo and drives from a Sony machine into the new case. I thought that I would plug the PSU in and turn on, just to see if it worked before I dismantled my Sony system. (So no load is on the PSU).
I was surprised that the fan did not start, no sound at all! So, what does this mean? Is the PSU dead? Is it OK, but it needs a load to start working? Or is it working, but the fan only starts as the PSU heats up?

Any advise about which is correct?

[pave_spectre]

I think you may find that a PSU requires a load across two of its terminals before it will power up.

[david eaton]

An ATX power supply will not power up until switched on, and this is done through the motherboard connector. Applying power with no M/B puts it in stand by mode until activated by the power switch on the front panel. Don't worry, it's probably OK.

David