Computer doesn't boot up

Sharp Sharp xv-348p replacement projecto...
August 14, 2009 at 10:32:53
Specs: Windows Vista 64, 4 GB/ DDR3 1600/ CPU = 3.0GHz quad core, phenom 2 AMD
So I built my computer.

I inserted the RAM different ways, I've inserted my graphics card right, the PSU is plugged in the 24pin motherboard connector, the cpu has the heatsink attached & connected. My HDD & lite-on dvd driver are connected to both the PSU & mobo, corresponding to the correct cables, my case fans are hooked up, everything is in correctly and I followed all of the manual instructions.

But the computer won't start up.
My specs -

ATI Radeon 4890
MSI Motherboard, 790 GTX
3.0 GHz AMD Quad core
750 GB HDD
550 W PSU
[case] ATX Tower, x2 250mm fans on the side

I'm thinking my PSU isn't powerful enough, because everything looks like it is assembled right, and all of the parts are compatible. Any help please? Thanks.

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August 14, 2009 at 13:26:37
Did you plug the CPU Power Lead into the Motherboard as well as the 24 pin ATC connector ??

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August 14, 2009 at 14:14:50
I found out what it was now, the 4 pin in the motherboard was unplugged, and I found out the PSU never came with it. Suffice to say, the computer won't work with out it. Thanks for the answer.

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