GhostlessTheory :
Please describe in more detail. I am not that experienced yet... I am only 14...
Haha thats okay

Take the pc and leave just cable to graphics card so u can see something on the screen,disconnect mouse,keyboard,headphones and psu and that kind of stuff.Btw are you sure you got all cables connected? i made this mistake ones that i forgot to connect the cpu 4pin connector
http://oi44.tinypic.com/jtkves.jpg
reset CMOS by removing the motherboard battery for one minute and then plugging it back in
http://pctechnotes.com/wp-content/uploads/2009/09/remove-battery.jpg ,
http://pctechnotes.com/wp-content/uploads/2009/09/cmos_battery1.jpg , Remove 1 RAM ,connect the power supply and turn on the pc.If it works.turn everything off put everything back and enjoy let me know what happened