New built Pc wont boot

Ekliberty

Honorable
Oct 24, 2013
16
0
10,510
Hello i am new to building computers and i recently built one but it wont boot. I have reset CMOS im pretty sure. I did a test on the PSU and it works fine.Also i have rewired and made sure everything was in fully. What could it be that i did wrong?
My Specs are:

Motherboard: MSI B75MA-P45
Power Supply:500W Corsair CX500
Processor:Intel Core i5-3470
Hard Drive:1TB Western Digital Caviar Black
Graphics Card:XFX Radeon HD 7870
Case:NZXT Source 220
RAM: 8GB Corsair Vengeance DDR3
I Also tried to do all of the trouble shoot things found on this form and everything was ok... But i have not gotten as far as the BIOS because my PC has not booted yet..
Reply ASAP please wanna get it working soon so i can work on my things