Shutting Down before Post: Building new system

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Hello all,

I am having a huge problem. I am building a new system and attempting to test it before I put all parts in. I have the RAM, MOBO, CPU, and fans in. My case has 420W. I have plugged the pw led in to start. When I press it, all fans come on, the front of the case lites up, then 3-5 seconds later it all shuts down. If I press the switch again, same result.

I have tried with and without RAM and Graphics card.

What am I missing. I need help dear friends!
 
Hello and Welcome to Techspot!!

Have you check all the connections? Especially the 4-pin ATX +12V power cable that powers the CPU?
 
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