Pc wont turn on

I have a prob i need a advice my pc wont turn on yestereday my brother pressed reset or restart key again and again rpeateadly and now it wont start on first try it takes several startup for it to start i cant understand the problem when i start my pc my cpu fan runs but screen remains blank and after several tries it starts normally and works fine plz need urgent advice
Specs
I5 3470
Gigabyte h61m-s mobo
8gig ram
750ti boost gpu
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