Well lets start with the essentials,

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020 - corsair 650w psu

http://www.newegg.com/Product/Product.aspx?Item=N82E16811146068 - case

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727 - phenom II x4 965 BE

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130608 - msi 970-A motherboard

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231308 - 8gb ddr3 1066 ram

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102908 - 6850 hd radeon

http://www.newegg.com/Product/Product.aspx?Item=N82E16835106142 - cpu cooler

win7-64bit

artic silver thermal paste stuff

That should cover the basics. Now the problem. As the title states, PC will not power. This is freshly built, fresh as in two days ago I pieced it all together. I have had it up and running for those two days. Installing software, updating, getting everything on it I want and need. Then came the killer, I was ready to OC...MSI comes with OC genie II which worked decent, jumped the processor from 3.4 to 3.8 no problem at all but with my set up I knew it could be better. So I disabled OC genie and tried amd's auto tune thing in the catalyst or whatever their thing is, and well after a few minutes it must have shut off and my power button was just blinking.

I could not get it to power back up after. My fear is my cpu is now fried. What happens now is when I turn the power on the case/cpu fans kick on for a split second and the leds on the fans/case turn on then instantly it all turns off. This tells me power is getting to the things? I am not sure its late and I will be testing tomorrow after work, any ideas or suggestions? I know I need to clear the cmos/take battery out and hopefully its just an auto turn off due to the OC tool.

How can I test my psu without buying a tool? How would I tell if its my motherboard/cpu/ram/etc?

 *Edit*

Just to add nothing felt hot, smelled funny, or looked out of the ordinary when all of this went down.

CPU did not look damaged in any way, the pins were fine and no burnt marks or smells.

*Update*

Ok recap time,

-Pulled it all apart
-Noticed one of the two ATX 4-pin connectors (for the CPU) was loose.
-I can get it to turn on and remain on with the following connected gpu/ram/case fans/basically everything but the cpu. But it does not display anything on screen.
-When I do connect the power to the cpu it flashes/spins fans for a split second and turns off. Even when I unplug all but the cpu.

Later on when sillyface goose get off her computer I can going to test my ram/cpu/psu in her system and her psu in mine. This should narrow it down to whether its my psu/mb/cpu. Hoping its the mb to be honest, she threw away my cpu box so I can send it back -_-;;

Why I think its the mb, if one of the 4-pin connectors was loose this could short the connection on the mb? But at the same time it could short the wire on the psu or even the cpu? lol I hate myself for rushing this build! 

Why did you buy an AMD CPU? x_x;

Intel is way expensive, I dont need to drop $150+ bucks on a cpu that I can get for $100- that is comparable. With new egg deals I paid $99.99 for the cpu with free shipping, show me an intel cpu that comes close to that in price/performance :D

Your CPU's probably fine.

Open up your case, reset your battery (it says in your motherboard manual how to do that). Then reboot. Still doesn't start? Try switching the power supply unit (if you have any lying around). If it works now, you have toasted your PSU (which would be crazy, as the Corsair 650w should be very reliable, but it's even more unlikely that you fried your CPU).

If you really fried your CPU, it's your own fault though. Overclocking is not done the way you did it. Small steps man, small steps.

And if that doesn't work try disconnecting everything that is non essential (HDD, Disc drive etc) and swapping the videocard out if possible, then try and boot.

Yeah reset the battery/did the jumper thing still nothing. took it apart rechecked the wiring, notta. started going one piece at a time and got it to boot with only the main power to the motherboard. but when i put in my cpu power back in and does the split second fan spin and notta.

So now I am thinking either the cpu fried (most likely) or somehow the power port on the motherboard and/or the psu rails fried. lol not sure how likely that one is.

Oh well I shouldnt have rushed this build just trying to get it going asap

first thing is power off the PSU and hit the power button a few times to discharge then try to turn the computer on again. second thing is to reset the bios, look at your instruction manual, if both don't work then see if you have a backup PSU to test things with, if that doesn't work, you are in fucking pain land since you'd have to test different parts after that.

Actually I think I may have found the problem. When coming back over everything it seems the psu rails connecting into the power did not fully click in, like its split into two connectors one side clicks in the other side just goes in.

If it was not fully in in the first place it would start but the abuse would short it no?

which part are you talking about, do you have a modular psu?

No its not modular. I am talking about the rail you plug into your cpu power slot on the board. Doesnt seem like it had both plugs connected, just one clicked in.