How to tell if anythings broken (HELP)

Hi i just built my pc, and its not working.  When I flip the switch on the back of the psu all of the fans start up and there is 1 light falshing and slightly beeping.  Also nothing happens when I push the on switch.  What should i do.   I was thinking of taking it apart and rebuilding it while looking at a tutorial.  

 

PS its my first time lol.

What motherboard are you running?(give us a parts list) make sure your rams seated properly and do you get anything on the display?

 

No i dont get anything on display and my RAM is vengeance 8 gb 1600.  Phenom iix4 965be wd 1tb cav blue, sapphire 7850, MSI 970A-G46 AM3+, and a lg optical drive.  And a nzxt gamma classic.  plz help

Have you got the 140w or the 125w Phenom iix4 965?

Did you connect the 8 pin cpu power connector the right way, or  4+4 pin..