Is it my PSU... or something else?

I recently finished putting together a homebuild everything is plugged in where it should be (24 pin to 24, 8 pin to 8), but the only reaction my computer has when I press the "Power" button on the front of the case is a single flash of red LED and then its gone. The fans do not start, nothing.

Does anyone know what may be wrong? Is there something I may be not double checking?

If it helps here is the build:

H61M/US3S
HD6870
PSU OCZ 600
Crucial 8gb ram (4x2)
i3 2130
HAF 912 - Cooler Master Case
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More about else
  1. Run through this guide step by step http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems
    I presume you used the motherboard standoffs?
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