Just going from my experience:
I've had this happen to me twice, on two old motherboards (about 2 years ago) after overclocking (probably due to my inexperience at the time). The first time, I heard the system make a light pop sound on boot up, the machine powered on, fans on etc, but nothing else. It would just sit there with nothing on the screen, not even hitting post. It turned out I had blew the VRM and after exchanging the motherboard, all was well.
The second time, I heard the pop and the machine wouldn't even power on at all. I took the assumption I had killed the PSU, and I later learned I was correct when I swapped it out. Again, my stupidity, it was a fairly crappy supply, unbranded etc (I've since learned my lesson and only look to reputable brands). So saying that, OCZ, as far as I'm aware, make very high quality supplies, so it'd be a mile away from the crap I had.
I would say it's likely you've just overworked the motherboard. I would suggest, if it's at all possible, try each component in a different machine (say a friends) - that's something I did at the time, in both my experiences. It will help you determine if the problem is with any of the other components and so on.