Hello I really need help... I just built my first pc. And I'm already off to a bad start... I put togeather all my parts and I started up my system for the first time and it comes on and my case fans and my graphics card fans spin and that's it .. It does this for a few seconds then it cuts off then reacts over and over until I turn it all... I have everything plugged in tight and locked in correctly but it's still not on.. o have troubleshooted everything i could find on youtube... And I don't know what to do anymore.. I have come down with the thought that my cpu is shot.. please help.. if u need more info please let me know