SMC Reset Won't Work on Macbook Pro Retina mid-2012 I have followed all the correct steps for carrying out an SMC Reset, however my Mac continues to boot normally. 

The issues I currently am dealing with are:


Slow performance
Battery light on power cable not lighting
Loud fans when just browsing on Safari
I found the answer under this link
http://support.apple.com/kb/HT3964


  1.Shut down the computer.
  
  2.Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  
  3.On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  
  4.Release all the keys and the power button at the same time.
  
  5.Press the power button to turn on the computer.


I have the same model and I tested it. So in my case I had full charged the macbook and the led light from MagSafe power adapter change from green to orange.

When I had the same problem with you (with the led in magsafe adaptor not lighting) I solve it just with a pram reset. You can get info about how to reset pram here: http://support.apple.com/kb/ht1379