PSU problems

[NM130]

I got a new FSP AX400-PN to replace my old FSP 250W PSU. Anyways, after a lot of struggling to get the 20 pin mobo cable out, I managed to reconnect everything correctly, but found that the computer would not boot! I looked closely at the new PSU's 20 pin connector, and found that there was an empty space to where no cable was connected. I looked at my old PSU, and found that in the space, there was a white cable connected. I will probably contact FSP and ask for a replacement, unless somebody here has a possible other solution.

I have, however, another problem. The old power supply, after having connected it, does not boot either. I am pretty sure I have connected everything in the correct place, so what could it be? Could it be the motherboard? I think a couple of weird cylinder things (I'm obviously a noobie at building PC's) may have gotten a little loose from all the pulling, as may have a stick of RAM (it doesn't help to have IDE cables in the way...).

Thanks in advance.

Pictures: (sorry for bad quality, taken with cell phone camera)
Old PSU 20-pin connector
New PSU 20-pin connector

EDIT: Should this be in technical support? Please move if it should be.

 

[NM130]

Anyone? Please?

 

[Boobers]

The white wire is normally -5v and is not required for newer motherboards...

If you broke off some capacitors (weird cylinder things), that motherboard may never boot again...

 

[NM130]

I haven't broken any off, some seem to be a bit looser than others...
If the capacitors didn't work, would anything happen? The fans spinning for a second, etc. or would it just not turn on?

How new is "new"? I have a SiS 648 based mobo (MS-6701), would it require the white cable? Do you think I should RMA it or keep it?

 

[NM130]

Bump