Asus P7P55 LX boot problem?

I've just bought a new PC. I built it myself. When I press the start button, fans work for a second and they stop. Then after a few seconds they start again and stop again etc... I don't know if it is a mainboard problem or a PSU.
-Asus P7P55 LX
-Intel core i5 750
-2Gb RAM
-Ati Radeon EAH 5670
-Thermaltake purepower RX 450W
The connections are all right.
Please help...
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More about asus p7p55 boot problem
  1. can u boot into the hard disk or is it the problem only with fan?
    what about the displays?
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