Tried to replace my processor, now my computer won't turn on

I tried to upgrade from an i3 to an i5. When I installed the new processor, my computer turned on for about 1 second before turning off. I then reinstalled my i3, which put my computer in a start up loop with nothing showing on my monitor. I tried to start up the computer with the windows disc and the motherboard boot disc, but got nothing. Any suggestions on what to do?
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More about replace processor computer turn
  1. System specs? Specifically your motheboard and CPU. Also, have you plugged in the 8-Pin power connector for your cpu into the motherboard.
  2. My motherboard is an msi h61m-p31/w8, supports Intel. I'm trying to put an i5-3470 in it.
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