I assume you mean it won't boot after you tried to apply the overclock? Have you tried using the jumper on the motherboard to reset your CMOS? Depending on what you've done you might have fried something but that is a good start.
Ok i will try and tell me and i think my jumper looks like a rectangle shap thing and i have to put it in the other two pins am i right or wrong i looked in the internet and they look exactly the same thing and sorry if i am. Not good at this