Same happened to me awhile back.   I thought the noise was a hard drive so I ordered 2 online thinking I'd catch it before it crashes.   Then, before I got the drives... Blamo...    Wouldn't even turn on to boot to the BIOS...  Point being I got 2 new hard drives when I really needed to order a new power supply 
 
  
Someday I want to just smash a computer to shit, an Office Space type scene.
 
 
 
 
- kero