PSU turns off when nothing on my mobo

[chico1st]

I have this PSU which is never supposed to be fanless (always spins a little it seems from the reviews).
http://www.techpowerup.com/reviews/Antec/EA-650_Platinum/

I am troubleshooting my computer right now (which wont power on) and this new PSU (above) powers on for a second, then turns off if I have nothing attached to my mobo.
My old PSU stayed on (Antec Neo 560 W), could it be that my new PSU has a short circuit protection? and turns itself off?

Or do most PSUs just power off when they have no load?

 

[rolli59]

If you do not have a CPU installed it will power off!

 

[chico1st]

Oh really, so what do i need connected to just make my computer post and create case beeps.
I want to get it down to the bare minimum

 

[rolli59]

CPU and both power connectors to the board.

 

[chico1st]

then to go with this how do i determine if my CPU or my mobo is busted, since i have to have them both in at once?

 

[rolli59]

Usually it is the motherboard in those cases! You should have a power on and beep codes for missing ram, no beep bad board.

 

[chico1st]

huh, ok since you're being very nice and helping. i do get a power on LED (mobo to case LED) when my cpu is attached, and my drive activity led flashes every 5s or so if i attach my harddrive (mobo to case light)

but no beeps

EDIT: and i get no video output with my video card no onboard (tried 3 video cards, so i decided thats not the problem)

 

[rolli59]

If you have no beeps (presuming mobo speaker installed) with no ram installed the board is bad.

 

[chico1st]

ok ill check it when i get home but there are definitly no beeps, i can measure it with my multimeter in case the speaker is broken somehow.