Help with new build

Hi,

I had some issues with my pc so thought it was time for a rebuild keeping a few of the existing components.

I plug everything in and switch on, CPU fan comes on for about a second, computer then switches itself off and restarts and just repeats this process.

I unplug/replug everything double checking it all, switch on, CPU fan comes on for a second and then computer switches itself off. This time it does not go into a restarting loop like before.

I have removed components one by one to see if any of them are the cause, but no matter what i try it comes on for a second and then switches itself off.

I am at a complete loss, only thing i can think of is its a broken CPU?

MOBO: Asus P8Z77-V DELUXE Z77 Socket 1155
RAM: 4x4gb DDR3 1600 corsair
CPU: Intel Core i5 3450 3.1GHz Socket 1155
HDD: Samsung 64GB 830 Series SS
GFX: ATI Radeon 5800 HD (kept from existing pc)
PSU: Antec 650w (kept from existing pc)
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More about help build
  1. Unplug all of the front panel headers from the motherboard and power it on with the motherboard power switch. I've seen faulty reset switches that have a continuously closed circuit. That or make sure your reset headers are correct. Just something to try off the bat.
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