Semi new build pc fans shut off after 5 seconds boot

what could be my problem? I use to have a dell but the case was all screwy so I went and bought a new Mobo Intel® Desktop Board DP35DP, and a new PSU Toughpower 650W. I put in the MOBO in my new ATX case and hooked up the 24 pin power cord. I also hooked up the 4 pin cpu cord and made sure my CPU was in place. The Fan i had already had a thermal pad on it and added one stick of memory to make sure i didnt get errors.

I tried to power the computer and the fans ran for 5 seconds and then stopped. The MOBO still shows green light on it but fans still dont work until i restart the process. What is the problem and how can i fix it?

Do you have a computer speaker plugged in (the thing that gives error beeps) if so is it beeping?

What fans stop? The CPU fan? case fans?

Also full system specs are extremely helpful.

I went to fry's and purchased a new CPU. Problem solved!

Thank you all for helping. I was hoping it was a bios or something small but it ended up being a $179 fix. I should have known it was the CPU since the same thing was happening on the dell and the new case only had a CPU with the same issue.

Thanks a bunch, over and out.

I just built this yesterday for myself Liquid Cooling Rig.

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