computer boots up for 2 seconds then shuts down

I've just installed a new cpu and motherboard. When I turn the pc on, it shuts down after 1-2 seconds. It then turns itself on again and this happens a few times.

I'm thinking I may have not plugged something in?
What is the problem?
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  1. Best answer
    This troubleshooting checklist was created for this type of problem.
    "No POST", "system won't boot", and "no video output" troubleshooting checklist
    "No POST", "system won't boot", and "no video output" troubleshooting checklistThis checklist is a compilation of troubleshooting ideas from many forum members. It's very important to actually perform every step in the checklist if you want to effectively... Read More
  2. Well that was embarrassingly simple. I hadn't plugged in the cpu power cable.

    In my defence, I had looked at the cable and wondered where it had to be plugged in! :D

    Thanks, lifesaver.
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