Connected new charger with Macbook Pro. Both Macbook Pro and Charger stopped working. Any reasons?
Try resetting the SMC (System Management Controller) — the SMC controls many hardware features of the Mac and resetting it can fix problems such as a Mac not responding to the Power button:


  Power
  The computer doesn't respond to the power button when pressed.


Source: http://support.apple.com/kb/HT3964


Connect your friend's known working charger.
Press ⇧⌃⌥ and the power button, then release all at the same time.

The Mac shouldn't boot and will remain off. The LED on the MagSafe connector may change colour and/or flash briefly.
With the charger still connected, press the power button to turn your Mac back on.