New build powering on and off

I just finished a new build and trying to boot for the first time. Its doing something strange. I turn it on and it begins to start for about 2-3 secs, then it turns off and repeats this non stop. Never posting or booting. Power lights come on for those 3 secs then off again. No beeps or nothing, just this same cycle on and off. Had six sticks of memory in it and went down to 1 and same thing. Had two video cards in it, and went down to one and same thing. Any ideas?

Intel 975 cpu i7
gigabyte Ex-58 extreme
BFG 295 video card
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